EP0185652B1 - Tintenstrahlmosaikschreibkopf - Google Patents

Tintenstrahlmosaikschreibkopf Download PDF

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Publication number
EP0185652B1
EP0185652B1 EP19860200146 EP86200146A EP0185652B1 EP 0185652 B1 EP0185652 B1 EP 0185652B1 EP 19860200146 EP19860200146 EP 19860200146 EP 86200146 A EP86200146 A EP 86200146A EP 0185652 B1 EP0185652 B1 EP 0185652B1
Authority
EP
European Patent Office
Prior art keywords
ink
tubes
printing head
drum
tube
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
EP19860200146
Other languages
English (en)
French (fr)
Other versions
EP0185652A3 (en
EP0185652A2 (de
Inventor
Giadomenico Dagna
Enrico Manini
Giorgio Tadini
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.)
Telecom Italia SpA
Original Assignee
Ing C Olivetti and C SpA
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
Priority claimed from IT68093/81A external-priority patent/IT1144625B/it
Application filed by Ing C Olivetti and C SpA filed Critical Ing C Olivetti and C SpA
Priority to EP19860200146 priority Critical patent/EP0185652B1/de
Publication of EP0185652A2 publication Critical patent/EP0185652A2/de
Publication of EP0185652A3 publication Critical patent/EP0185652A3/en
Application granted granted Critical
Publication of EP0185652B1 publication Critical patent/EP0185652B1/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
    • 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
    • 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
    • B41J2/17—Ink jet characterised by ink handling
    • B41J2/175—Ink supply systems ; Circuit parts therefor

Definitions

  • the present invention relates to an ink jet printing head according to the introductory part of claim 1.
  • U.S. 4,025,928 Another ink jet printer, with a single ink ejecting tube, is known from U.S. 4,025,928.
  • the single ink ejecting tube is fixed into a cylindrical chamber filled with the ink.
  • An elastic conduit is connected at one end to the ejecting tube and is helically coiled around the ejecting tube from near the top of the chamber down to the chamber bottom, so that the other open end of the conduit can deliver all the ink to the ejecting tube.
  • a pair of U-shaped resilient bands are provided in the chamber to bias the coiled conduit against the walls of the chamber, whereby the helical conduit requires a relatively large space around the ejecting tube. This arrangement is thus unadapted for a compact multi-nozzle printing head.
  • the object of the invention is to provide a compact, multi-nozzle ink jet printing head which reduces the problem of excessive space being occupied by the flexible tube connecting each ejecting tube to the ink tank.
  • the printing head according to the present invention is characterised in the manner set forth in claim 1.
  • the printer S comprises a head 1 mounted on a carriage 10 moved along guides 12 by an electric motor 13 by means of a cable 14.
  • the head 1 is formed by a rigid structure 2 (Figs 2 and 3) consisting of a front plate 3 and a rear plate 5 which are parallel to one another and kept spaced apart by two side members 7, 9.
  • the head 1 can print in both directions along a printing line L (Fig. 1) on a carrier 15 passed around a platen 16.
  • the timing device 17 generates the clock signals as a function of the position of the head along the printing line L and, therefore, the clock signals are independent of the speed of the head itself.
  • the synchronizing device 17 generates forty-two clock pulses while the head 1 shifts by a distance equal to the pitch p (Fig. 4) between two adjacent nozzles.
  • each of the plates 3 and 5 there is formed a row of holes 22, for example twenty holes, which is inclined with respect to the direction of the movement of the carriage 10, each hole in the plate 3 being aligned with the corresponding hole in the plate 5.
  • the holes 22 are equidistant by the pitch "p", measured in the direction of the movement of the carriage 10.
  • cylindrical tubes 24 adapted to contain ink which is to be expelled in the form of drops by a known technique, as will be described hereinafter. All the tubes 24 lie in a plane having the course F'-F' indicated by a chain-dotted line in Fig.
  • the tubes 24 are firmly fixed in the holes 22 of the plates 3 and 5 by cementing with a resin, for example an epoxy resin, in such manner that the front end 26 thereof is positioned level with the outer surface 27 of the plate 3.
  • a resin for example an epoxy resin
  • the tubes 24 project from the rear plate 5 by a certain length to permit their connection by means of the tubes 30 to an auxiliary ink reservoir 31 connected in turn by means of a flexible tube 32 to a main reservoir not illustrated in the drawings.
  • the auxiliary reservoir 31 is fixed at the rear of the carriage 10 on a wall 33 of a paral- lelepipedal container 34 for protecting the tubes 30.
  • the tubes 30, which are of flexible material, are supported by a cylindrical drum 130 fixed to the side walls 132 of the container 34 by means of a shaft 133 coaxial with the drum 130.
  • Each flexible tube 30 is wound around the outer surface of the drum 130 for one and a half turns, inasmuch as it begins and ends, respectively, in two diametrically opposite positions with respect to the drum 30.
  • the flexible tubes 30 are wound around it alternately in opposite directions, whereby each half turn of the winding coil left free by one of the tubes 30 is occupied by the first half turn of the adjacent tube.
  • this arrangement of the tubes 30 serves to prevent knocks between the tubes 30 caused by the forces of inertia generated by the movement of the carriage 10 (Fig. 1) at the stops and starts of the carriage.
  • the tubes 24 may be of chemically inert material such as, for example, glass or ceramic, but they may also be of metal, for example stainless steel or nickel.
  • piezoelectric transducers 36 in the form of sleeves are cemented approximately half way along the tubes, the transducers being adapted to contract radially under the effect of an electric voltage pulse applied to them.
  • the inner and outer surfaces of the sleeves 36 are covered by two electrodes 37 and 38, respectively, the electrode 37 being brought over onto the outer surface of the sleeve to facilitate electrical connection.
  • a printed circuit board 40 is located between the plates 3 and 5 and is traversed by the sleeves 36.
  • the electrodes 37 and 38 are soldered to corresponding tracks 43 and 44 tying on the faces 45 and 46, respectively, of the board 40 (Fig. 4).
  • the plate 40 projects at the bottom from the head (Figs. 3, 4) to permit electrical connection by means of a connector not shown in the drawings.
  • a resin polymerizable at room temperature and of low shrinkage for example an epoxy resin, to form a single block 48 enclosing all the tubes 24 and the corresponding sleeves 36.
  • the block of resin 48 When hardening has taken place, the block of resin 48 establishes a rigid and continuous connection between the plates 3 and 5, preventing the vibrations of each tube being transmitted through the plates to the adjacent tubes, Moreover, the block of resin 48 constitutes a reliable protection for the extremely fragile tubes 24 against possible knocks or shocks.
  • a lamina 51 Mounted removably against the outer face 27 of the front plate 3 by means of screws 50 is a lamina 51 with a thickness less than that of the plate 3 and in which there are formed twenty nozzles U o
  • each of which is disposed in perfect alignment with respect to the corresponding tube 24.
  • the alignment of the nozzles U with the respective tubes 24 is ensured by locating pins 52 fixed to the plate 3 and engaged in holes 53 in the lamina 51. In this way, the lamina 51 can be separated easily from the plate 3 to permit cleaning of the nozzles in the event of any of them becoming blocked because of drying of the printing ink.
  • Each nozzle U is formed by an orifice 54 of cylindrical form of a diameter between 50 and 90 um, and a conically flared portion 56 connecting the orifice 54 with the inner diameter of the tubes 24, which is of the order of 0.8 mm.
  • a drop of ink can be expelled from each nozzle U by the effect of the compression exerted by the corresponding transducer 36 when energized by a voltage pulse.
  • All the transducers 36 are electrically connected through the medium of the printed circuit board 40 and a 20-wire cable 45 indicated diagrammatically in Fig. 1 to an energizing unit 58 of known type and not described in detail, which is able to energize selectively in parallel any or all of the twenty transducers 36.
  • the energizing unit 58 receives in parallel on a bus 55 a string of twenty bits corresponding to the dots which are to be printed simultaneously by the twenty nozzles U.
  • the printing bits are processed by a driving logic circuit 60 illustrated in Fig. 5, which comprises a read/write memory 62 with 1024 address locations.
  • the memory 62 is connected through a bus 64 to a latch 66 for temporary storage of the memory addresses which arrive on a bus 68 from an address multiplexer 70 driven directly by a microprocessor control unit 72 through a bus 74.
  • An adder 76 executes at each cycle a shift by a predetermined number K of places to permit the multiplexer 70 to address correctly the information stored in the memory 62, in accordance with a procedure described later on.
  • the number K corresponds to the number of dots printable in the pitch "p" between two adjacent nozzles and can assume predetermined values.
  • a manual entering device 80 for example a switch with a plurality of sections, is connected to the adder 76 through the medium of a bus 77 and enables the predetermined number K to be forced into the adder 76 in known manner.
  • the controller 72 addresses a character generator 82 which contains the ciarac- ters to be printed in columns of dots in accordance with a predetermined matrix.
  • the characters to be printed are extracted from a line memory known perse which is connected to the controller 72 and not shown in the drawings.
  • the generator 82 is connected via a bus 83 to the memory 62 for storing in succession the information appertaining to the columns of dots of the characters to be printed.
  • the memory 62 is constituted by 1024 address locations or positions Pl o , ... P1 1 , ... PI 1024 with cyclic updating (Fig. 5).
  • each address position PI there are stored the twenty bits relating to the dots of each column of the matrix of the character, which is formed in the present case by twenty rows L o , L 1 , ... L, o (Fig. 6) (there being twenty nozzles) and a predetermined number of columns, for example forty-eight.
  • the memory 62 is connected through a bus 85 to an output multiplexer 86 for reading the bits corresponding to the twenty nozzles of the head 1.
  • the multiplexer 86 is driven by an up/down counter 90, according to the direction of printing, which is adapted to count cyclically up to twenty, for successively transferring the bits of the dots to be printed, which are read out of the memory 62, by means of a wire 93 to a bidirectional/shift register 94 having twenty locations and of the serial input and parallel output type.
  • the counting direction of the counter 90 and the shift register 94 is supplied by the controller 72 on a wire 91 on the basis of the desired direction of printing.
  • the register 94 is connected through the bus 55 to the energizing unit 58 (Fig.
  • the first nozzle U o When the head 1 is located in a generic position along the printing line L (Figs. 1 and 6), the first nozzle U o will print the dot P o of a generic column of dots C, on a line L o , the second nozzle will print the dot P 1 corresponding to a column C I - 42 shifted by forty-two printing positions with respect to the column C, and so on, the nozzle U 18 will print the dot P 18 of the column C i-756 and finally the nozzle U 19 will print the dot P 19 belonging to the column C l-798 , that is shifted back with respect to the direction of movement of the carriage 10 by 798 printing positions with respect to the first column C,.
  • the controller 72 addressing the location Pl o of the memory 62 through the medium of the multiplexer 70 and the latch 66, writes in that location the information appertaining to the column C, prepared by the character generator 82.
  • the counter 90 enables the output multiplexer 86 to extract the bit corresponding to the first nozzle U o from the address position of the first column of dots C, and to load it into the register 94.
  • the controller 72 causes the latch 66 to change over via the address multiplexer 70 to a memory location PI-42 set back by 42 positions with respect to the preceding one to address therein the information appertaining to the column C i-42 corresponding to the second nozzle U 1 and previously stored in the memory 62 in a stage similar to that hereinbefore described.
  • the shifting by K-42 positions is executed by the adder 72, which adds the number K, entered on the switch 80, to the serial number of the preceding address.
  • the counter 90 is incrementd or decremented by one so that the multiplexer 86 extracts the bit corresponding to the second nozzle U 1 . This procedure will be repeated by degrees for all the twenty nozzles U. More particularly, the bit corresponding to the twentieth nozzle will be extracted from the last address location P1 798 , corresponding to the column C i-798 ⁇
  • the second nozzle U 1 has been brought onto the column C,, which belonged before to the first nozzle U o
  • the third nozzle U 2 has been brought onto the column C,- 42 , and so on
  • the last nozzle U 19 has been brought into vertical alignment on the penultimate column C 1-756 ⁇
  • the nozzle U 19 will be in vertical alignment on the column C, which will be printed completely with the twenty dots belonging to it. Proceeding in a similar manner, all the columns of dots will be printed in this way and will form a complete row of vertically printed characters.
  • the driving circuit of Fig. 5 enables the slope of the printed characters to be varied in one direction or the other with respect to the vertical by a simple operation. To vary the slope of the printed characters, it is sufficient to vary the number K forced into the adder 76 by means of the switch 80.
  • U 19 will print their dot in a position advanced respectively by one, two, ... nineteen printing positions with respect to the normal state. In this way, an alignment of the dots of each printed column which is sloped forward will be obtained. In a completely similar manner, a backward slope of the columns of printed dots will be obtained if K is taken as greater than 42.
  • the printing speed can be considerably increased due to the cyclic updating of the memory 62.
  • the information relating to the columns of dots of the characters to be printed is stored in the memory 62 in cyclic succession; simultaneously, the output multiplexer 86 extracts successively from each column just stored a bit corresponding to the dot to be printed by means of each of the twenty nozzles of the head.
  • the speed of loading of the register 94 by the multiplexer 86 is considerably increased.
  • the printing speed of the nozzles can also be increased up to values such as to be able to turn to account the maximum frequency of repetition of the emission of drops of ink by each piezoelectric element.
  • the number K selected to vary the slope of the characters may be entered directly from the controller 72 instead of through the switch 80 (Fig. 5).
  • the number K selected is forced directly by the controller 72 into the adder 76 on the basis of predetermined instructions processed by the controller in response to predetermined commands received in known manner. Consequently, the entering device 80 in Fig. 5 is eliminated and the bus 77 is connected between the controller 72 and the adder 76.
  • the tubes 24 can be cut so as not to project from the rear plate 5 (Fig. 7).
  • Small pieces of tubing 24' projecting inside the container 34 are cemented through the front plate 33' of the container 34.
  • the tubes 30 are fitted over these small pieces 24'.
  • the plate 33' of the container 34 is fixed rigidly by means of screws and locating pins, not shown in the drawing, so as to ensure registration between the tubes 24 and 24'.

Claims (9)

1. Tintenstrahl-Druckkopf (1) mit mehreren Röhren (24) zum Ausstoßen von Tinte, wobei jede Tintenausstoßröhre mit einem Umformer (36) versehen ist, der wählbar zum Ausstoßen eines Tropfens Tinte durch eine entsprechende Düse (U) betätigbar ist, die Tintenausstoßröhren (24) an einem Traggestell (2, 34) befestigt und jeweils mit Tinte über eine Tintenrohrleitung (30) versorgt werden, die mit einem Tintenvorratsraum (31) verbunden und aus flexiblem Material in einer Länge hergestellt ist, die größer als der Abstand zwischen jedem Ausstoßrohr und dem Vorratsraum ist, dadurch gekennzeichnet, daß die Tintenrohrleitungen (30) auf einen gemeinsamen Wikkelkörper (130) gewickelt sind, der von dem Traggestell (2, 34) getragen wird und zwischen den Tintenausstoßröhren (24) und einem gemeinsamen Vorratsraum (31) angeordnet ist, wobei jede Tintenrohrleitung (30) schraubenlinienförmig auf der Außenseite des Wickelkörpers (130) in einer Anordnung herumgewickelt ist, die eine optimale Raumausnutzung ergibt.
2. Druckkopf nach Anspruch 1, dadurch gekennzeichnet, daß die Achse der schraubenlinienförmig gewickelten Tintenrohrleitungen (30) senkrecht zu den Tintenausstoßröhren (24) steht.
3. Druckkopf nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Wickelkörper (130) eine zylindrische Trommel aufweist, die am Traggestell (2, 34) befestigt ist, wobei jede Tintenrohrleitung (30) mit eineinhalb Windungen um die Trommel zwischen sich auf dem Umfang der Trommel diametral gegenüberliegenden Stellen herumgewickelt ist.
4. Druckkopf nach Anspruch 3, dadurch gekennzeichnet, daß die Tintenrohrleitungen (30) so um die Trommel (130) herumgewickelt sind, daß jede von einer der Tintenrohrleitungen freigelassene Windungshälfte durch die erste Windungshälfte einer benachbarten Tintenrohrleitung belegt ist, so daß die durch die Tintenrohrleitungen belegte axiale Länge der Trommel minimal ist.
5. Druckkopf nach Anspruch 3 oder 4, dadurch gekennzeichnet, daß das Gestell (2, 34) auf einem relativ zu einem Drucksupport (16) bewegbaren Wagen (10) gelagert ist und daß der Vorratsraum (31) durch eine flexible Leitung (32) mit einem ortsfesten Tintenbehälter verbunden ist.
6. Druckkopf nach Anspruch 5, bei dem die Tintenausstoßröhren (24) parallel zueinander und in einer in bezug auf die Bewegungsrichtung des Wagens (10) geneigten Ebene liegen, dadurch gekennzeichnet, daß das Traggestell eine vordere une eine hintere Platte (3, 5) aufweist, die parallel und in einem Abstand voneinander angeordnet sind, daß die Tintenausstoßröhren (24) senkrecht zu und an den Platten befestigt sind, daß die Platten einen ersten Hohlraum mit einem polymerisierbaren Harz (48) gefüllt ist, so daß die Platten (3, 5), die Röhren (24) und das Harz (48) einen einzigen Block bilden.
7. Druckkopf nach Anspruch 6, dadurch gekennzeichnet, daß jede Tintenausstoßröhre (24) über die hintere Platte hinausragt und mit dem Vorratsraum (31) durch eine flexible Tintenrohrleitung (30) verbunden ist, die an dem vorstehenden Ende der Röhre angeschlossen ist, daß die Tintenrohrleitungen (30) durch eine feststehende zylindrische Trommel (130) abgestützt sind, die auf dem Traggestell (2, 34) gelagert ist, und daß die Tintenrohrleitungen (30) abwechselnd in entgegengesetzten Richtungen um eineinhalb Windungen um die Trommel (130) herumlaufen, so daß die axiale Länge der von den Tintenrohrleitungen belegten Trommel minimal ist.
8. Druckkopf nach Anspruch 6, dadurch gekennzeichnet, daß das Traggestell (2,34) einen zweiten Hohlraum neben dem ersten Hohlraum aufweist, daß der zweite Hohlraum in einem Behälter (34) ausgebildet und durch eine dritte Platte (33) begrenzt ist, und daß der Behälter (34) lösbar mit dem Block (3, 5, 24, 48) in einer Lage verbindbar ist, in der die dritte Platte und die hintere Platte (5) nebeneinanderliegen und rohrartige Verbindungsmittel (24'), die auf der dritten Platte gelagert sind, mit den Tintenausstoßröhren (24) fluchten, wobei die rohrartigen Verbindungsmittel (24') jeweils ein Ende aufweisen, das in den zweiten Hohlraum jenseits der dritten Platte (33') ragt und mit jeweils einer der Tintenrohrleitungen (30) verbunden ist.
9. Druckkopf nach einem der Ansprüche 6, 7 oder 8, dadurch gekennzeichnet, daß die Umformer elektrisch mit einem gedruckten Schaltungselement (40) verbunden sind, das in dem ersten Hohlraum des Gestells und senkrecht zu den Tintenausstoßröhren (24) angeordnet ist, von den Umformern quer durchsetzt ist und aus dem Harzblock vorsteht, so daß die Umformer von außen elektrisch zugänglich sind.
EP19860200146 1981-08-04 1982-07-19 Tintenstrahlmosaikschreibkopf Expired EP0185652B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP19860200146 EP0185652B1 (de) 1981-08-04 1982-07-19 Tintenstrahlmosaikschreibkopf

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
IT68093/81A IT1144625B (it) 1981-08-04 1981-08-04 Stampante a punti a getto d inchiostro
IT6809381 1981-08-04
EP19860200146 EP0185652B1 (de) 1981-08-04 1982-07-19 Tintenstrahlmosaikschreibkopf

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
EP82303776A Division-Into EP0072110B1 (de) 1981-08-04 1982-07-19 Farbstrahlmosaikschreiber
EP82303776A Division EP0072110B1 (de) 1981-08-04 1982-07-19 Farbstrahlmosaikschreiber

Publications (3)

Publication Number Publication Date
EP0185652A2 EP0185652A2 (de) 1986-06-25
EP0185652A3 EP0185652A3 (en) 1986-10-01
EP0185652B1 true EP0185652B1 (de) 1989-05-24

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Application Number Title Priority Date Filing Date
EP19860200146 Expired EP0185652B1 (de) 1981-08-04 1982-07-19 Tintenstrahlmosaikschreibkopf

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Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3832579A (en) * 1973-02-07 1974-08-27 Gould Inc Pulsed droplet ejecting system
DE2543420C3 (de) * 1975-09-29 1980-09-11 Siemens Ag, 1000 Berlin Und 8000 Muenchen Piezoelektrisches Antriebselement für Schreibköpfe in Tintenmosaik-Schreibeinrichtungen
US4032929A (en) * 1975-10-28 1977-06-28 Xerox Corporation High density linear array ink jet assembly
US4025928A (en) * 1976-04-19 1977-05-24 Gould Inc. Unitary ink jet and reservoir
JPS55126461A (en) * 1979-03-26 1980-09-30 Canon Inc Cartridge-type recording head
JPS5660259A (en) * 1979-10-22 1981-05-25 Ricoh Co Ltd Ink-jet head

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Publication number Publication date
EP0185652A3 (en) 1986-10-01
EP0185652A2 (de) 1986-06-25

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