EP0202370B1 - Druckkopf - Google Patents

Druckkopf Download PDF

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Publication number
EP0202370B1
EP0202370B1 EP19850303545 EP85303545A EP0202370B1 EP 0202370 B1 EP0202370 B1 EP 0202370B1 EP 19850303545 EP19850303545 EP 19850303545 EP 85303545 A EP85303545 A EP 85303545A EP 0202370 B1 EP0202370 B1 EP 0202370B1
Authority
EP
European Patent Office
Prior art keywords
printing head
film member
film
printing
casing
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
EP19850303545
Other languages
English (en)
French (fr)
Other versions
EP0202370A1 (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 EP19850303545 priority Critical patent/EP0202370B1/de
Priority to DE8585303545T priority patent/DE3577674D1/de
Publication of EP0202370A1 publication Critical patent/EP0202370A1/de
Application granted granted Critical
Publication of EP0202370B1 publication Critical patent/EP0202370B1/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
    • 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

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 piezo-electric drive means.
  • nozzle stoppage which, in effect, causes a white point to be printed on the printing paper.
  • a coated tape has to be thrown away after one printing operation.
  • a stylus printing head is described in US Patent 4,387,384; a continuous loop of perforated ribbon is passed through an ink bath and an in front of a stylus which is selectively operated to thrust ink from a film thereof formed across the perforations in the ribbon onto a record medium to effect printing. Ribbon drive and print head translation are effected by separate drives.
  • a printing head comprising a casing member having at least one ink reservoir therein, a film member having a plurality of holes or recesses therein, and at least one rotatable drive member which drivingly engages the film member and is rotatable so as to move a portion of the film member from a position in which it is immersed in ink in the or an ink reservoir to a printing position at which transfer of ink from the film member to a recording medium takes place, characterised in that the film member is moved over a thermal printing element in contact with a heating surface thereof at the printing position, in that the printing head is formed as a removable cassette, and in that a part of the or a rotatable drive member projects from the casing member for engagement with a cooperating drive member to effect rotation thereof.
  • the projecting parts of the rotatable drive members are formed with driving gears for engagement with a cooperating toothed belt orientated such that rotation of the drive members and consequent movement of the film member are caused by translation of the printing head parallel to the record medium.
  • the thermal printing element may be mounted in or extend into an open recess in the casing member, film guiding means being provided for guiding the film member to and from the heating surface, the film guiding means being disposed adjacent the open recess and being carried by the casing member.
  • the film member may be provided with a plurality of holes or recesses whose diameter does not exceed 250 um.
  • the film member may be provided with apertured and unapertured portions which alternate with each other longitudinally of the film member, each apertured portion comprising a plurality of the said holes or recesses.
  • a printing head block comprising a plurality of the said casing members arranged side by side to form an integral unit, each casing member being provided with a respective thermal printing element and film member, the ink reservoirs of the various casing members being adapted to be filled respectively with differently coloured inks.
  • the film member is an endless film member.
  • the thermal printing element is spaced from the casing member, a portion of the film member passing externally of the casing member through sealing means.
  • FIGs 1-3 there is shown a first embodiment of a printing head according to the present invention.
  • the printing head is of the cassette type and comprises a casing 1, such as a box, which is adapted to be detachably mounted on a main body of a printing machine (not shown).
  • An open recess 2 is provided at the top portion of the casing member 1.
  • a thermal printing element 3, as shown by a dotted line, is introduced into the open recess 2 when the casing 1 is mounted on the said main body (not shown).
  • the greater part (or, if desired, the whole) of the thermal printing element 3 is disposed within the recess 2 and thus within the casing 1.
  • the casing 1 has an ink reservoir 9a therein within which are rotatably mounted first and second pulleys 4, 5.
  • a flexible film member 7 (best shown in Figure 2) has a plurality of holes or recesses 6 whose diameter may be about 10-200 pm.
  • the film member 7 may be made of a metal or organic material, for example flexible polyimide film.
  • the film 7 extends between and drivingly engages the first and second pulleys 4, 5, so that rotation of the latter effects movement of the film member 7.
  • the film member 7 is movably mounted via a pair of film guiding members 8 which are positioned in the neighbourhood of the open recess 2.
  • Each film guiding member 8 is composed of a pair of guide elements 8a and 8b which are made of felt material respectively. This ensures that any unnecessary liquid ink 9, additional to that in the small holes 6, is eliminated.
  • the film guiding members 8 also serve to guide the film member 7 to and from a heating surface 3a of the thermal printing element 3, the film guiding members 8 being disposed adjacent the open recess 2 and being carried by the casing member 1.
  • a plurality of apertured portions or small hole groups 6a are provided in the film member 7 so as to extend over a predetermined distance in the longitudinal direction of the film member 7.
  • an unapertured portion 6b i.e. the small hole groups 6a and unapertured portions 6b are arranged alternately.
  • An unapertured portion 6b may be brought into contact with the heating surface 3a of the thermal printing element 3 by moving the film member 7 by means of the pulleys 4, 5.
  • One or more small hole groups 6a will then be immersed in the liquid ink 9 in the ink reservoir 9a within the casing member 1 so that drying out of the ink 9 in the small holes 6 is prevented.
  • the small holes are provided throughout the length of the film member 7, it being possible to use this type of film member 7 by always rotating it by means of the pulleys 4, 5.
  • Shafts 4a, 5a which respectively carry the pulleys 4, 5, as shown in Figure 3, protrude into bearing portions 1b of mounting portions 1a which are integrally mounted on one face of the casing member 1.
  • Drive gears 46, 5b which are drivingly connected to a driving means (not shown) are respectively mounted at the outer ends of the shafts 4a, 5a.
  • Two adjacent O-ring members 10 are positioned between each mounting portion 1a and the respective shafts 4a, 5a to prevent leakage of the ink 9 and to produce a braking effect so as to prevent over running of the shafts 4a, 5a.
  • FIG 4 shows a colour printing head block 11 which is composed of four cassette casing members 1, of the kind shown in Figures 1-3, for printing a Y colour (Yellow), an M colour (Magenta), a C colour (Cyan) and a BLK colour (Black), the four casing members 1 being arranged side by side to form an integral unit.
  • Each casing member 1 is thus provided with a respective thermal printing element 3 and film member 7, the ink reservoir 9a of the various casing members 1 being filled respectively with the said inks.
  • the casing members 1 are arranged to form one integral structure which extends longitudinally of the direction in which the film member 7 is moved.
  • a pair of guide bars 13 are slidably mounted in a pair of guide holes 12 which are provided in the bearing portions 1b of the casing members 1.
  • the colour printing head block 11 is arranged to be reciprocated on the guide bars 13, whereby to provide a cassette type serial colour printing head for a serial colour printing system.
  • a lock mechanism not shown.
  • Figure 5 shows another embodiment of the present invention in which only one pulley 4 is rotatably mounted in the ink reservoir 9a in the casing member 1.
  • the pulley 4 has a shaft 4a which is rotatably driven by a driving means (not shown).
  • An endless type film member 7a is arranged to slide over the heating surface 3a (which may be provided with thermal dot elements) of the thermal printing element 3.
  • a part of the film member 7a is engaged and deflected by a tension roller 15.
  • the latter is pivotally mounted on an inner wall of the casing member 1 and is urged towards the film member 7a by a spring member 14.
  • the small holes (not shown) in the film member 7a are repeatedly used for printing.
  • FIGs 6 and 7 show another embodiment of the present invention constituted by a cassette printing head for a line printing system.
  • a casing member 1 has mounted therein a pair of hollow cylinder members 1c, 1d each of which has a length which is almost the same as the width of the paper (not shown) which is to be printed.
  • Each cylinder member 1c, 1d is provided at its opposite end with plate members 1e, 1f which substantially seal the cylinder members 1e, 1d.
  • Liquid ink 9 is housed in an ink reservoir in each of the cylinder members lc, 1d
  • Pulleys 4c, 5c are rotatably mounted within these ink reservoirs.
  • a film member 7 which has a plurality of small holes (not shown) therein is mounted on the pulleys 4, 5 so as to be driven thereby, the film member 7 being guided by gaps in guide member 8c, so as to pass into and out of the cylinder members 1c, 1d.
  • One surface of the film member 7 is in contact with the heating surface 3a of the thermal printing element 3 which is mounted in an open recess in the casing member 1g between the cylinder members 1c, 1d.
  • the pulleys 4c and 5c have shafts 4a, 5a respectively and driving gears 4b, 5b are formed integrally therewith, as shown in Figure 7.
  • the embodiment of Figures 6 and 7 constitutes a one colour line printing cassette head.
  • the construction shown in Figure 8 is a line colour printing head comprising a line cassette head block 16 having four cassette printing heads for printing Y, M, C and BLK colours, each said printing head having the construction shown in Figures 6 and 7.
  • the cassette printing heads are arranged side by side so as to extend in the same direction as a recording paper 17.
  • the recording paper 17 is slidably moved over the line cassette head block 16 by a belt 20 which has a plurality of suction holes (not shown) therein, the belt 20 being moved by a pair of pulleys 18, 19.
  • the recording paper 17 is maintained in tight contact with the belt 20 by a vacuum means 21.
  • Each of the cassette printing heads described above may easily be detachably mounted on a printing machine (not shown), the respective thermal printing element 3 being mounted in the open recess 2 of the casing member 1 whereby the casing member 1 and thermal printing element 3 are constructed to be effectively integral with each other.
  • the ink 9 in the small holes 6 of the film member 7, as illustrated in Figure 9, is jetted onto the recording paper 17 by bubble pressure when the heating surface 3a of the thermal printing element 3 is energised (by means not shown).
  • FIG 10 there is shown a colour printer comprising a printer head frame 33 which carries four printing heads 32.
  • Each of the printing heads 32 comprises a box-shaped casing member 1h having grooves 1j therein within which are mounted arms 34 by means of which the casing member 1h is carried by the frame 33.
  • Ink 9 is provided in an ink reservoir 9a within each casing member 1h, a pair of pulleys 4d, 5d being rotatably mounted within each ink reservoir 9a.
  • the inks 9 in the ink reservoirs 9a are of the various colours described above.
  • a film 7b which is composed of thin metal, or of a resin material such as polyimide, are connected to the pulleys 4d, 5d.
  • a driving shaft 25 is rotatably mounted in the casing member 1h above the pulleys 4, 5.
  • One end of the driving shaft 25 protrudes outwardly of the casing member 1h and has a gear member 25a.
  • An idler 26 is provided between the driving shaft 25 and the pulley 5d and a further idler 26 is provided between the pulleys 4d, 5d.
  • the driving shaft 25, by way of the idlers 26, drives the pulleys 4d, 5d.
  • the pulleys 4d, 5d and the film 7b are driven in the same direction. However, if desired, it is possible to rotate the pulleys 4d, 5d and drive the film 7b by pressure contact therebetween which does not involve a gear connection.
  • One end portion of the film 7b extends outwardly of an open portion 27 which is provided at the top of the casing member 1b, the film 7b passing between sealing members 30 and protrusions 29 of a plug 28 so that ink is prevented from escaping from the casing member 1h.
  • An ink filling plug 31 ( Figure 12) is detachably mounted at the side of the casing member 1h so that ink may be introduced into the casing member 1h when the ink level drops.
  • each printer head 32 is constituted by an ink cassette which is detachably attached to the printer head frame 33. It is thus possible to remove a cassette printer head 32 from the printer head frame 33 by moving the respective supporting arms 34 away from each other and pulling a knob 32a by hand.
  • a plurality of thermal printing elements 3 are mounted on the printer head frame 33, one for each of the four ink cassettes 32 which may contain inks of the four colours Y, M, C and BLK.
  • An exposed portion 7c of each film 7b i.e. a portion thereof disposed outwardly of the respective casing member 1h, extends in contact with an outside surface of the respective thermal printing element 3.
  • Each of the gear members 25a of the ink cassette printer heads 32 drivingly engages a timing belt 37 of a printer body 35 and is also engaged by a further pulley 28 which is mounted on the printer head frame 33.
  • the printer head frame 33 is arranged to be reciprocated over a pair of guide bars 39 of the printer body 35.
  • the driving shafts 25 are thus rotated by the timing belt 37, so that a paper 41 on a platen 40 can be printed.
  • ink in holes or recesses 6 is jetted onto the paper 41 by bubble pressure produced by heating the thermal printing element 3.

Landscapes

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

Claims (9)

1. Druckkopf mit einem Gehäuseteil (1), das wenigstens einen Druckfarbenvorrat (9a) darin hat, einem Folienteil, das eine Mehrzahl von Öffnungen oder Ausnehmungen (6) darin hat, und mit wenigstens einem drehbaren Antriebselement (4, 5), das in Antriebseingriff mit dem Folienteil (7) und derart drehbar ist, daß ein Abschnitt des Folienteils (7) von einer Position, in der es in die Druckfarbe (9) in dem oder einem Druckfarbenvorrat (9a) eingetaucht ist, zu einer Druckposition bewegbar ist, in der die Übertragung der Druckfarbe von dem Folienteil (7) zu einem Aufzeichnungsmaterial (17, 41) erfolgt, dadurch gekennzeichnet, daß das Folienteil (7) über ein Thermodruckelement (3) in Kontakt mit einer Heizfläche (3a) desselben an der Druckposition bewegt wird, daß der Druckkopf als eine auswechselbare Kassette ausgebildet ist und daß ein Teil (4a, 4b, 5a, 5b) des oder eines drehbaren Antriebselementes (4, 5) von dem Gehäuse (1) vorsteht und in Eingriff mit einem zusammenarbeitenden Antriebselement (37) zum Bewirken einer Drehbewegung desselben kommt.
2. Drukkopf nach Anspruch 1, dadurch gekennzeichnet, daß die vorspringenden Teile (4a, 5a) des drehbaren Antriebselements (4, 5) mit einer treibenden Verzahnung (4b, 5b) versehen sind, die in Eingriff mit einem zugeordneten Zahnriemen (37) kommt, der derart ausgerichtet ist, daß die Drehung der Antriebselemente (4, 5) und folglich die Bewegung des Folienteils (7) durch die Translationsbewegung des Druckkopfes parallel zum Aufzeichnungsmaterial (17, 41) bewirkt wird.
3. Druckkopf nach Anspruch 1 oder Anspruch 2, dadurch gekennzeichnet, daß das Thermodruckelement (3) in einer offenen Ausnehmung (2) in dem Gehäuse (1) angebracht ist oder sich in dieselbe erstreckt, daß Folienführungseinrichtungen (8a, 8b) zum Führen des Folienteils (7) zu der Heizfläche (3a) und von dieser weg vorgesehen sind, und daß die Folienführungseinrichtungen in der Nähe der offenen Ausnehmung (2) angeordnet sind und von dem Gehäuseteil (1) getragen werden.
4. Druckkopf nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß das Folienteil (7) mit einer Mehrzahl von Öffnungen oder Ausnehmungen (6) versehen ist, deren Durchmesser nicht größer als 250 pm ist.
5. Druckkopf nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß das Folienteil (7) mit mit Öffnungen versehenen Abschnitten und mit Abschnitten ohne Öffnungen versehen ist, welche abwechselnd zueinander in Längsrichtung des Folienteils (7) angeordnet sind, wobei jeder mit Öffnungen versehene Abschnitt (6a) eine Mehrzahl von Öffnungen oder Ausnehmungen (6) aufweist.
6. Druckkopf nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß ein Druckkopfblock (11) eine Mehrzahl von Gehäuseteilen (1) aufweist, die nebeneinander unter Bildung einer einteiligen Einheit angeordnet sind, daß jedes Gehäuseteil (1) mit einem zugeordneten Thermodruckelement (3) und einem Folienteil (7) versehen ist, wobei die Druckfarbenvorräte (9a) der verschiedenen Gehäuseteile (1) derart ausgelegt sind, daß sie jeweils mit unterschiedlichen Druckfarben (9) füllbar sind.
7. Druckkopf nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß das Folienteil (7a) ein endloses Folienteil ist.
8. Druckkopf nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß eine Mehrzahl von Antriebselementen (4d, 5d) vorgesehen ist, die jeweils in dieselbe Richtung über eine Antriebswelle (25) angetrieben werden, und daß ein leerlaufendes Teil (26), das in dem Gehäuseteil (1h) angeordnet ist, zwischen den Antriebselementen (4d, 5d) angeordnet ist.
9. Druckkopf nach Anspruch 1, dadurch gekennzeichnet, daß das Thermodruckelement (3) einen Abstand von dem Gehäuseteil (1h) hat und daß ein Abschnitt des Folienteils (7b) von der Außenseite des Gehäuseteils (1h) kommend durch die Dichtungseinrichtungen (28 bis 30) geht.
EP19850303545 1985-05-20 1985-05-20 Druckkopf Expired EP0202370B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP19850303545 EP0202370B1 (de) 1985-05-20 1985-05-20 Druckkopf
DE8585303545T DE3577674D1 (de) 1985-05-20 1985-05-20 Druckkopf.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19850303545 EP0202370B1 (de) 1985-05-20 1985-05-20 Druckkopf

Publications (2)

Publication Number Publication Date
EP0202370A1 EP0202370A1 (de) 1986-11-26
EP0202370B1 true EP0202370B1 (de) 1990-05-16

Family

ID=8194228

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19850303545 Expired EP0202370B1 (de) 1985-05-20 1985-05-20 Druckkopf

Country Status (2)

Country Link
EP (1) EP0202370B1 (de)
DE (1) DE3577674D1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE59404446D1 (de) * 1994-02-23 1997-11-27 Oce Printing Systems Gmbh Thermotransferdruckvorrichtung zur übertragung eines druckbildes auf einen aufzeichnungsträger

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH495590A (de) * 1968-06-21 1970-08-31 Precisa Ag Verfahren zum Drucken von Zeichen und Vorrichtung zur Durchführung des Verfahrens
CH548866A (fr) * 1971-11-17 1974-05-15 Battelle Memorial Institute Dispositif d'impression avec une encre liquide, conductrice d'electricite.
FR2448979B1 (fr) * 1979-02-16 1986-05-23 Havas Machines Dispositif destine a deposer sur un support des gouttes d'encre
JPS5675886A (en) * 1979-11-27 1981-06-23 Ricoh Co Ltd Recorder
US4561789A (en) * 1983-06-23 1985-12-31 Nippon Telegraph & Telephone Public Corp. Thermal ink transfer printing system

Also Published As

Publication number Publication date
EP0202370A1 (de) 1986-11-26
DE3577674D1 (de) 1990-06-21

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