EP0236937A1 - Device for controlling the ink in ink-writing devices - Google Patents

Device for controlling the ink in ink-writing devices Download PDF

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Publication number
EP0236937A1
EP0236937A1 EP87103092A EP87103092A EP0236937A1 EP 0236937 A1 EP0236937 A1 EP 0236937A1 EP 87103092 A EP87103092 A EP 87103092A EP 87103092 A EP87103092 A EP 87103092A EP 0236937 A1 EP0236937 A1 EP 0236937A1
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EP
European Patent Office
Prior art keywords
ink
hollow needle
insulating ring
sealing element
needle
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.)
Withdrawn
Application number
EP87103092A
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German (de)
French (fr)
Inventor
Dietmar Dipl.-Ing. Pohlig
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
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Siemens AG
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Application filed by Siemens AG filed Critical Siemens AG
Publication of EP0236937A1 publication Critical patent/EP0236937A1/en
Withdrawn legal-status Critical Current

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    • 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
    • B41J2/17566—Ink level or ink residue control

Definitions

  • the invention relates to a device for ink monitoring by detecting the level-dependent change in resistance between two electrodes in ink writing devices according to the preamble of claim 1.
  • Ink writing devices require an ink reservoir from which the ink is fed directly to the individual writing nozzles and without bubbles.
  • Current ink storage containers are provided as replaceable parts, the flow connection between the ink storage container and the ink writing device being effected by a hollow needle which pierces a sealing element when the ink storage container is placed on. Monitoring the fill level of the ink reservoir is of great importance. One of the reasons for this is that air can enter the ink supply system through a completely emptied container, which leads to a considerable malfunction.
  • the one electrode is formed by the hollow needle, which establishes a connection between the ink supply system and the ink reservoir.
  • the second electrode can also be formed in that at least the bottom part of the ink reservoir is covered with an electrically conductive layer.
  • the second electrode is passed through the sealing element parallel to the hollow needle. This often leads to problems, since the material stress on the very small sealing element becomes so great that an absolutely ink-tight seal can no longer be guaranteed. In particular, if the ink supply container is not placed on the hollow needle from above, but rather is plugged on in the horizontal direction, problems arise since the second electrode then has to be passed through the sealing element in the immediate vicinity of the hollow needle.
  • the object of the invention is to provide a device for ink monitoring, with which the stress on the sealing element is reduced to such an extent that leaks no longer occur.
  • the advantages of the invention consist essentially in the fact that greater security against leakage of ink is ensured in the area of the sealing element and that the device can be used with particular advantage for ink writing devices in which the ink reservoir is plugged onto the ink writing device in a horizontal direction, that is if the ink reservoir is arranged so that the longitudinal axis of the hollow needle runs approximately parallel with the ink surface in the ink reservoir.
  • FIG. 1 shows in section an ink supply container 1 made of plastic, which has a sealing element 2 in one of its walls.
  • the sealing element is made of elastic material and is pierced by a hollow needle 3 when the ink supply container 1 is placed on the ink supply system of the writing head part of the ink writing device, not shown here.
  • the hollow needle 3 is part of the print head structure.
  • the direction of insertion of the ink reservoir 1 onto the actual writing head of the ink writing device takes place here in the horizontal direction, ie the longitudinal axis of the hollow needle 3 runs approximately parallel to the ink surface in the ink reservoir 1.
  • the hollow needle 3 forms the one electrode which does not have a connection 6 here shown evaluation circuit is connected.
  • Such an evaluation circuit can be constructed as in DE-PS 26 17 730.
  • a metal needle 4 is provided as the second electrode and is arranged in the bottom part of the ink reservoir 1.
  • the metal needle 4 is passed through the bottom part of the ink reservoir 1 and is located in an insulating ring 5 formed by inwardly raised shapes of the bottom part.
  • the metal needle 4 is with the second type 7 connected to the evaluation circuit for detecting and evaluating a change in resistance.
  • the insulating ring 5 not only increases the mechanical stability, but also serves to improve the seal in the passage area of the metal needle 4.
  • the upper edge of the insulating ring 5 and thus also the upper edge of the metal needle 4 are higher than the lowest point of the sealing element 2 penetrating hollow needle 3.
  • the resulting height difference is designated 8 in the drawing.
  • the connection between the metal needle 4 and the inks in the ink reservoir breaks off, while at the same time the hollow needle is still in contact with ink.
  • the resistance between the metal needle 4 and the hollow needle 3 changes considerably, that is to say between the two electrodes which are connected to the connections 6 and 7 of the evaluation circuit, for example from the kilo-ohm range to the mega-ohm range. This change in resistance is detected in a manner known per se by the evaluation circuit and leads to the output of a warning signal.
  • the height difference 8 between the upper edge of the metal needle 4 and the lowest point of the hollow needle 3 is also a measure of the remaining volume of ink then remaining.
  • an ink end signal can be emitted by a circuit which is also known to have a time-delay effect and with which, for example, the entire ink writing device is then automatically switched off.

Abstract

Die Überwachung des Tintenvorrats in einem Tintenvorrats­behälter (1) geschieht durch Messung und Auswertung der Wi­derstandsänderung zwischen zwei sich im Inneren des Tin­tenvorratsbehälters (1) befindlichen Elektroden (3, 4), von denen die eine durch die Hohlnadel (3) gebildet wird, die eine Fließverbindung zwischen Tintenvorratsbehälter (1) und Tin­tenversorgungssystem herstellt; die zweite Elektrode (4) befindet sich in einer Wandung des Vorratsbehälters (1) und ist in einem Isolierring (5) angeordnet, der durch nach innen hochgezogenene Wände des Tintenvorratsbehälters (1) gebildet wird.

Figure imgaf001
The ink supply in an ink supply container (1) is monitored by measuring and evaluating the change in resistance between two electrodes (3, 4) located inside the ink supply container (1), one of which is formed by the hollow needle (3), the other Establishes a flow connection between the ink reservoir (1) and the ink supply system; the second electrode (4) is located in a wall of the storage container (1) and is arranged in an insulating ring (5) which is formed by walls of the ink storage container (1) which are pulled upwards.
Figure imgaf001

Description

Die Erfindung betrifft eine Vorrichtung zur Tintenüber­wachung durch Erfassen der pegelabhängigen Widerstands­änderung zwischen zwei Elektroden in Tintenschreibein­richtungen gemäß dem Oberbegriff des Patentanspruches 1.The invention relates to a device for ink monitoring by detecting the level-dependent change in resistance between two electrodes in ink writing devices according to the preamble of claim 1.

Tintenschreibeinrichtungen benötigen einen Tintenvor­ratsbehälter, aus dem die Tinte den einzelnen Schreib­düsen direkt und blasenfrei zugeführt wird. Derzeitige Tintenvorratsbehälter sind als austauschbare Teile vorge­sehen, wobei die Fliesverbindung zwischen dem Tintenvor­ratsbehälter und der Tintenschreibeinrichtung durch eine Hohlnadel geschieht, die beim Aufsetzen des Tintenvor­ratsbehälters ein Dichtungselement durchstößt. Der Über­wachung des Füllstandes des Tintenvorratsbehälters kommt eine große Bedeutung zu. Einer der Gründe dafür ist, daß über einen völlig entleerten Behälter Luft in das Tinten­versorgungssystem eintreten kann, was zu einer erhebli­chen Betriebsstörung führt.Ink writing devices require an ink reservoir from which the ink is fed directly to the individual writing nozzles and without bubbles. Current ink storage containers are provided as replaceable parts, the flow connection between the ink storage container and the ink writing device being effected by a hollow needle which pierces a sealing element when the ink storage container is placed on. Monitoring the fill level of the ink reservoir is of great importance. One of the reasons for this is that air can enter the ink supply system through a completely emptied container, which leads to a considerable malfunction.

In einer bekannten Vorrichtung zur Überwachung des Vor­rates an Schreibflüssigkeit in einem Tintenvorratsbehäl­ter werden zwei Elektroden verwendet, über die eine vom Pegelstand der Flüssigkeit im Vorratsbehälter ab­hängige Widerstandsänderung erfaßt und in einer Schal­tungsanordnung bewertet wird (DE-PS 26 17 730). Gemäß diesem Stande der Technik wird die eine Elektrode durch die Hohlnadel gebildet, die eine Verbindung zwischen dem Tintenversorgungssystem und dem Tintenvorratsbehälter herstellt. Als zweite Elektrode dient eine im Boden des Tintenvorratsbehälters befestigte Niet. Die zweite Elektrode kann auch dadurch gebildet sein, daß mindestens der Bodenteil des Tintenvorratsbehälters mit einer elek­trisch leitenden Schicht überzogen ist. Bei Verringerung des Tintenvolumens im Tintenvorratsbehälter vergrößert sich der elektrische Widerstand zwischen den Elektroden, was in der nachgeordneten Schaltungsanordnung zur Auslö­sung einer Warnvorrichtung und zur Abgabe eines Warnsig­nals führt.In a known device for monitoring the supply of writing fluid in an ink reservoir, two electrodes are used, via which a change in resistance dependent on the level of the liquid in the reservoir is detected and evaluated in a circuit arrangement (DE-PS 26 17 730). According to this prior art, the one electrode is formed by the hollow needle, which establishes a connection between the ink supply system and the ink reservoir. A second in the bottom of the Ink reservoir attached rivet. The second electrode can also be formed in that at least the bottom part of the ink reservoir is covered with an electrically conductive layer. When the ink volume in the ink reservoir is reduced, the electrical resistance between the electrodes increases, which leads to the triggering of a warning device in the downstream circuit arrangement and to the emission of a warning signal.

Bei der bekannten Vorrichtung wird die zweite Elektrode parallel zur Hohlnadel durch das Dichtelement hindurch­geführt. Das führt häufig zu Problemen, da die Material­beanspruchung des sehr kleinen Dichtelementes dadurch so groß wird, daß ein absolut tintendichtes Verschließen nicht mehr gewährleistet ist. Insbesondere dann, wenn der Tintenvorratsbehälter nicht von oben auf die Hohlnadel aufgesetzt wird, sondern vielmehr in horizontaler Richtung aufgesteckt wird, ergeben sich Probleme, da dann die zweite Elektrode in unmittelbarer Nähe der Hohlnadel durch das Dichtelement hindurchgeführt werden muß.In the known device, the second electrode is passed through the sealing element parallel to the hollow needle. This often leads to problems, since the material stress on the very small sealing element becomes so great that an absolutely ink-tight seal can no longer be guaranteed. In particular, if the ink supply container is not placed on the hollow needle from above, but rather is plugged on in the horizontal direction, problems arise since the second electrode then has to be passed through the sealing element in the immediate vicinity of the hollow needle.

Aufgabe der Erfindung ist es, eine Vorrichtung zur Tinten­überwachung anzugeben, mit der die Beanspruchung des Dichtelementes soweit reduziert wird, daß Undichtigkeiten nicht mehr auftreten.The object of the invention is to provide a device for ink monitoring, with which the stress on the sealing element is reduced to such an extent that leaks no longer occur.

Diese Aufgabe wird gemäß dem kennzeichnenden Teil des Pa­tentanspruches 1 gelöst. Vorteilhafte Ausgestaltungen der Erfindungen sind in weiteren Unteransprüchen gekennzeich­net.This object is achieved according to the characterizing part of patent claim 1. Advantageous refinements of the inventions are characterized in further subclaims.

Die Vorteile der Erfindung bestehen im wesentlichen darin, daß im Bereich des Dichtelementes eine größere Si­cherheit gegen Tintenaustritt gewährleistet ist und daß die Vorrichtung mit besonderem Vorteil für Tintenschreib­einrichtungen eingesetzt werden kann, bei denen der Tin­tenvorratsbehälter in horizontaler Richtung auf die Tin­tenschreibeinrichtung aufgesteckt wird, wenn also der Tintenvorratsbehälter so angeordnet ist, daß die Längs­achse der Hohlnadel mit der Tintenoberfläche im Tinten­vorratsbehälter in etwa parallel verläuft.The advantages of the invention consist essentially in the fact that greater security against leakage of ink is ensured in the area of the sealing element and that the device can be used with particular advantage for ink writing devices in which the ink reservoir is plugged onto the ink writing device in a horizontal direction, that is if the ink reservoir is arranged so that the longitudinal axis of the hollow needle runs approximately parallel with the ink surface in the ink reservoir.

Einzelheiten der Erfindung werden im folgenden anhand eines in den Zeichnungen dargestellten Ausführungsbei­spieles erläutert.Details of the invention are explained below with reference to an embodiment shown in the drawings.

Das in der Figur 1 dargestellte Ausführungsbeispiel zeigt im Schnitt einen aus Kunststoff bestehenden Tinten­vorratsbehälter 1, der in einer seiner Wandungen ein Dichtelement 2 aufweist. Das Dichtelement besteht aus ela­stischem Material und wird beim Aufsetzen des Tintenvor­ratsbehälters 1 auf das Tintenversorgungssystem des hier nicht dargestellten Schreibkopfteiles der Tintenschreib­einrichtung von einer Hohlnadel 3 durchstoßen. Die Hohl­nadel 3 ist Bestandteil des Schreibkopfaufbaues. Die Auf­steckrichtung des Tintenvorratsbehälters 1 auf den ei­gentlichen Schreibkopf der Tintenschreibeinrichtung er­folgt hier in horizontaler Richtung, d.h. die Längsachse der Hohlnadel 3 verläuft in etwa parallel zur Tintenober­fläche im Tintenvorratsbehälter 1. Die Hohlnadel 3 bildet dabei die eine Elektrode, die mit einem Anschluß 6 einer hier nicht dargestellten Auswerteschaltung verbunden ist. Eine derartige Auswerteschaltung kann wie in der DE-PS 26 17 730 aufgebaut sein. Als zweite Elektrode ist eine Metallnadel 4 vorgesehen, die im Bodenteil des Tintenvor­ratsbehälters 1 angeordnet ist. Die Metallnadel 4 ist da­bei durch den Bodenteil des Tintenvorratsbehälters 1 hin­durchgeführt und befindet sich in einem durch nach innen hochgezogene Ausformungen des Bodenteils gebildeten Iso­lierring 5. Die Metallnadel 4 ist mit dem zweiten An­ schluß 7 der Auswerteschaltung zur Erfassung und Bewer­tung einer Widerstandsänderung verbunden. Der Isolierring 5 erhöht nicht nur die mechanische Stabilität, sondern dient darüberhinaus auch zu einer Verbesserung der Ab­dichtung im Durchtrittsbereich der Metallnadel 4. Die obere Kante des Isolierringes 5 und damit auch die obere Kante der Metallnadel 4 liegen höher als der tiefste Punkt der das Dichtelement 2 durchdringenden Hohlnadel 3. Die dadurch gebildete Höhendifferenz ist in der Zeichnung mit 8 bezeichnet. Sinkt nun der Pegel der Tintenflüssig­keit im Tintenvorratsbehälter soweit ab, daß er die Ober­kante der Metallnadel unterschreitet, so reißt die Ver­bindung zwischen der Metallnadel 4 und der Tinten im Tintenvorratsbehälter ab, während gleichzeitig die Hohl­nadel noch mit Tinte in Berührung steht. Dadurch ver­ändert sich der Widerstand zwischen der Metallnadel 4 und der Hohlnadel 3 d.h. zwischen den beiden Elektroden, die mit den Anschlüssen 6 und 7 der Auswerteschaltung verbunden sind, ganz erheblich, z.B. vom Kilo-Ohm-Bereich zum Mega-Ohm-Bereich. Diese Widerstandsänderung wird in an sich bekannter Weise von der Auswerteschaltung erfaßt und führt zur Abgabe eines Warnsignales. Die Höhendiffe­renz 8 zwischen der Oberkante der Metallnadel 4 und dem tiefsten Punkt der Hohlnadel 3 ist zugleich ein Maß für das dann noch verbleibende Restvolumen an Tinte. Abhängig davon kann durch eine ebenfalls an sich bekannte zeitver­zögernd wirksam werdende Schaltung ein Tintenendesignal abgegeben werden, mit dem dann beispielsweise die gesamte Tintenschreibeinrichtung automatisch abgeschaltet wird.The exemplary embodiment shown in FIG. 1 shows in section an ink supply container 1 made of plastic, which has a sealing element 2 in one of its walls. The sealing element is made of elastic material and is pierced by a hollow needle 3 when the ink supply container 1 is placed on the ink supply system of the writing head part of the ink writing device, not shown here. The hollow needle 3 is part of the print head structure. The direction of insertion of the ink reservoir 1 onto the actual writing head of the ink writing device takes place here in the horizontal direction, ie the longitudinal axis of the hollow needle 3 runs approximately parallel to the ink surface in the ink reservoir 1. The hollow needle 3 forms the one electrode which does not have a connection 6 here shown evaluation circuit is connected. Such an evaluation circuit can be constructed as in DE-PS 26 17 730. A metal needle 4 is provided as the second electrode and is arranged in the bottom part of the ink reservoir 1. The metal needle 4 is passed through the bottom part of the ink reservoir 1 and is located in an insulating ring 5 formed by inwardly raised shapes of the bottom part. The metal needle 4 is with the second type 7 connected to the evaluation circuit for detecting and evaluating a change in resistance. The insulating ring 5 not only increases the mechanical stability, but also serves to improve the seal in the passage area of the metal needle 4. The upper edge of the insulating ring 5 and thus also the upper edge of the metal needle 4 are higher than the lowest point of the sealing element 2 penetrating hollow needle 3. The resulting height difference is designated 8 in the drawing. If the level of the ink liquid in the ink reservoir now drops so far that it falls below the upper edge of the metal needle, the connection between the metal needle 4 and the inks in the ink reservoir breaks off, while at the same time the hollow needle is still in contact with ink. As a result, the resistance between the metal needle 4 and the hollow needle 3 changes considerably, that is to say between the two electrodes which are connected to the connections 6 and 7 of the evaluation circuit, for example from the kilo-ohm range to the mega-ohm range. This change in resistance is detected in a manner known per se by the evaluation circuit and leads to the output of a warning signal. The height difference 8 between the upper edge of the metal needle 4 and the lowest point of the hollow needle 3 is also a measure of the remaining volume of ink then remaining. Depending on this, an ink end signal can be emitted by a circuit which is also known to have a time-delay effect and with which, for example, the entire ink writing device is then automatically switched off.

Im Rahmen der Erfindung ist es auch möglich wie in Fig. 2 beispielhaft dargestellt, im Bereich des Isolierringes 5 zur Aufnahme und zur Halterung der Metallnadel 4 ein tintendichtes elastisches Formteil 9 vorzusehen, in das die als Gegenelektrode vorgesehene Metallnadel 4 einge­preßt oder eingeklebt werden kann.Within the scope of the invention, it is also possible, as shown by way of example in FIG. 2, to provide an ink-tight elastic molded part 9 in the region of the insulating ring 5 for receiving and holding the metal needle 4, into which the metal needle 4 provided as the counter electrode can be pressed in or glued in.

Claims (3)

1. Vorrichtung zur Tintenüberwachung durch Erfassen der pegelabhängigen Widerstandsänderung zwischen zwei Elektro­den in Tintenschreibeinrichtungen, bei denen zur Verbin­dung zwischen dem Tintenvorratsbehälter und dem Tintenver­sorgungssystem eine ein Dichtelement durchstoßende Hohl­nadel vorgesehen ist, die zugleich die eine Elektrode bil­det,
dadurch gekennzeichnet, daß die zweite Elektrode eine Metallnadel (4) ist, die durch eine Wandung des Tintenvorratsbehälters (1) hindurchgeführt ist und in einem durch nach innen hochgezogene Ausformun­gen der Wandung gebildeten Isolierring (5) angeordnet ist.1. Device for ink monitoring by detecting the level-dependent change in resistance between two electrodes in ink writing devices, in which a hollow needle penetrating a sealing element is provided for the connection between the ink reservoir and the ink supply system, which hollow needle also forms the one electrode,
characterized in that the second electrode is a metal needle (4) which is passed through a wall of the ink reservoir (1) and is arranged in an insulating ring (5) formed by inwardly raised formations of the wall. 2. Vorrichtung nach Anspruch 1,
dadurch gekennzeichnet, daß der Isolierring (5) und die Metallnadel (4) im Bodenteil, das Dichtelement (2) in einer Seitenwandung eines Vorratsbe­hälters (1) angeordnet sind,
und daß die Oberkante des Isolierrings (5) höher liegt als der tiefste Punkt der das Dichtelement (2) durch­stoßenden Hohlnadel (3).2. Device according to claim 1,
characterized in that the insulating ring (5) and the metal needle (4) in the base part, the sealing element (2) are arranged in a side wall of a storage container (1),
and that the upper edge of the insulating ring (5) lies higher than the lowest point of the hollow needle (3) penetrating the sealing element (2). 3. Vorrichtung nach Anspruch 1 und 2,
dadurch gekennzeichnet, daß im Bereich des Isolierringes (5) zur Aufnahme und zur Hal­terung der Metallnadel (4) ein tintendichtes elastisches Formteil vorgesehen ist.3. Device according to claim 1 and 2,
characterized in that an ink-tight elastic molded part is provided in the region of the insulating ring (5) for receiving and holding the metal needle (4).
EP87103092A 1986-03-07 1987-03-04 Device for controlling the ink in ink-writing devices Withdrawn EP0236937A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3607576 1986-03-07
DE3607576 1986-03-07

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EP0236937A1 true EP0236937A1 (en) 1987-09-16

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EP87103092A Withdrawn EP0236937A1 (en) 1986-03-07 1987-03-04 Device for controlling the ink in ink-writing devices

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EP (1) EP0236937A1 (en)
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Cited By (5)

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EP0440110A1 (en) * 1990-01-30 1991-08-07 Seiko Epson Corporation Ink near-end detecting device
US5255019A (en) * 1990-01-30 1993-10-19 Seiko Epson Corporation Ink near-end detecting device
DE4411873A1 (en) * 1993-04-06 1994-10-13 Sharp Kk Ink jet printer and ink cartridge therefor
US5657058A (en) * 1990-01-30 1997-08-12 Seiko Epson Corporation Ink-jet recording apparatus and ink tank cartridge therefor
US7168800B2 (en) 2003-07-17 2007-01-30 Brother Kogyo Kabushiki Kaisha Inkjet recording apparatus and ink cartridge

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US5329304A (en) * 1988-11-22 1994-07-12 Canon Kabushiki Kaisha Remaining ink detecting device and ink jet head cartridge
JP2845916B2 (en) * 1989-01-13 1999-01-13 キヤノン株式会社 Liquid storage container, liquid jet recording head, and liquid discharge recording device
US5724076A (en) * 1994-04-04 1998-03-03 Rohm Co., Ltd. Out-of-ink detector and ink jet printer
JP3184737B2 (en) * 1994-05-27 2001-07-09 キヤノン株式会社 Recording head, recording head unit, ink tank, and ink jet recording apparatus having the recording head
JP3219641B2 (en) * 1994-07-15 2001-10-15 キヤノン株式会社 INK JET PRINTING APPARATUS, METHOD OF JUDGING REDUCED INK REMAINING VOLUME AND INFORMATION PROCESSOR
DE19613944C1 (en) * 1996-04-06 1997-09-11 Francotyp Postalia Gmbh Ink supply and disposal arrangement for an ink printhead
GB2409116A (en) * 2003-12-12 2005-06-15 Chao-Wei Huang Essence burner using resistance detection element to detect water level

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DE2617730C2 (en) * 1976-04-23 1982-04-29 Siemens AG, 1000 Berlin und 8000 München Device for monitoring the ink supply in ink writing devices
DE2842594A1 (en) * 1978-09-29 1980-04-10 Siemens Ag Ink supply system to typing head - has supply from stationary vessel controlled by level in travelling vessel
US4368478A (en) * 1980-06-06 1983-01-11 Shinshu Seiki Kabushiki Kaisha Ink supply system for ink jet printers
US4371880A (en) * 1981-08-17 1983-02-01 Stoelting Co. Disposable stylus and reservoir

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0440110A1 (en) * 1990-01-30 1991-08-07 Seiko Epson Corporation Ink near-end detecting device
US5255019A (en) * 1990-01-30 1993-10-19 Seiko Epson Corporation Ink near-end detecting device
US5657058A (en) * 1990-01-30 1997-08-12 Seiko Epson Corporation Ink-jet recording apparatus and ink tank cartridge therefor
US5844578A (en) * 1990-01-30 1998-12-01 Seiko Epson Corporation Ink-jet recording apparatus and ink tank cartridge thereof
US6045207A (en) * 1990-01-30 2000-04-04 Seiko Epson Corporation Ink-jet recording apparatus and ink tank cartridge therefor
DE4411873A1 (en) * 1993-04-06 1994-10-13 Sharp Kk Ink jet printer and ink cartridge therefor
DE4411873C2 (en) * 1993-04-06 2000-03-09 Sharp Kk Ink cartridge for an inkjet printer
US6286921B1 (en) 1993-04-06 2001-09-11 Sharp Kabushiki Kaisha Ink cartridge of an ink jet printer and an ink jet printer including an ink cartridge
US7168800B2 (en) 2003-07-17 2007-01-30 Brother Kogyo Kabushiki Kaisha Inkjet recording apparatus and ink cartridge

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US4782754A (en) 1988-11-08

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