EP1300248B1 - Tintenpatrone und Verfahren zur Detektion der restlichen Tintenmenge - Google Patents

Tintenpatrone und Verfahren zur Detektion der restlichen Tintenmenge Download PDF

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Publication number
EP1300248B1
EP1300248B1 EP02029048A EP02029048A EP1300248B1 EP 1300248 B1 EP1300248 B1 EP 1300248B1 EP 02029048 A EP02029048 A EP 02029048A EP 02029048 A EP02029048 A EP 02029048A EP 1300248 B1 EP1300248 B1 EP 1300248B1
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EP
European Patent Office
Prior art keywords
ink
chamber
case
hole
atmosphere connection
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 - Lifetime
Application number
EP02029048A
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English (en)
French (fr)
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EP1300248A3 (de
EP1300248A2 (de
Inventor
Toyonori Sasaki
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.)
Brother Industries Ltd
Original Assignee
Brother Industries Ltd
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Filing date
Publication date
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Publication of EP1300248A2 publication Critical patent/EP1300248A2/de
Publication of EP1300248A3 publication Critical patent/EP1300248A3/de
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Publication of EP1300248B1 publication Critical patent/EP1300248B1/de
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Expired - Lifetime 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
    • B41J2/17—Ink jet characterised by ink handling
    • B41J2/175—Ink supply systems ; Circuit parts therefor
    • B41J2/17503—Ink cartridges
    • B41J2/17513—Inner structure
    • 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
    • B41J2/17503—Ink cartridges
    • B41J2/17553—Outer structure
    • 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
    • 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
    • B41J2002/17573—Ink level or ink residue control using optical means for ink level indication

Definitions

  • This invention relates to an ink cartridge for holding ink that is supplied to a recording head, that is removably attached to recording heads used in image forming apparatuses, and to an ink volume detection method for the ink cartridge.
  • Image forming apparatuses such as ink jet printers eject ink droplets from nozzles in a recording head mounted on a carriage, thereby recording images on recording media.
  • the ejection of the ink droplets is accomplished by driving actuators such as electric-to-mechanical converter elements or electric-to-thermal converter elements positioned inside the recording head to generate pressure waves.
  • the ink is supplied from an ink cartridge mounted on the recording head so that it can be easily removed and replaced. When air bubbles are mixed in with the ink liquid that is supplied from the ink cartridge, however, this has an adverse effect on the ejection of ink from the nozzles in the recording head.
  • FIG. 20 is diagrammed an example of an ink cartridge structure as disclosed in Japanese Patent Application Laid-Open No. H9-70982/1997 .
  • An ink cartridge 150 has an ink supply hole 153 for supplying ink to a recording head 137, and an atmosphere connection hole 155 communicating to the outside atmosphere so as to allow air to flow in from outside the cartridge 150 as the ink volume is diminished by the consumption of ink absorbed in a porous material 152. Accordingly, after the ink cartridge 150 is filled with ink during fabrication, both of these openings (i.e. the ink supply hole 153 and atmosphere connection hole 155) are closed off by a sealing material. Also, as disclosed in Japanese Patent Application Laid-Open No.
  • H7-132611/1995 Gazette
  • the ink cartridge containing ink is sealed in a reduced-pressure condition inside a packaging bag to prevent ink leakage and the intrusion of air into the case prior to cartridge use.
  • the user removes the ink cartridge from the packaging bag, peels away the sealing material, thereby opening the atmosphere connection hole, and connects the ink supply hole to the recording head.
  • the ink supply hole and the atmosphere connection hole are located some distance apart in order both to prevent air from being drawn from the atmosphere connection hole into the ink supply hole via a short circuit and to facilitate use of the ink contained in the case without waste.
  • the ink supply hole and atmosphere connection hole are located on mutually opposing sides of the case, as diagrammed in Fig. 20 .
  • the ink supply hole 153 serves also as the ink filling hole
  • the atmosphere connection hole 155 is used as a pressure-reduction hole in order to reduce the pressure inside the case.
  • ink is filled in through the ink supply hole while effecting reduced pressure inside the case.
  • the sealing tape After sealing the ink filling hole (ink supply hole) with the sealing tape, the sealing tape has been heat welded by the application of heat. If the ink filling hole is wet with ink, however, heat welding cannot be adequately performed. When more heat is applied to avoid this, a problem arises in that the ink supply hole is deformed so that it cannot be properly connected-to the recording head.
  • the remaining ink volume is continually or periodically detected by a detector installed in the recording apparatus.
  • the recording apparatus advises the user to replace the ink cartridge.
  • This detection of the remaining ink quantity inside the ink cartridge is generally performed by detecting the ink liquid level.
  • the liquid level tends to shake and fluctuate because the ink cartridge is mounted on a carriage that moves in a sweeping motion in the width direction of the recording medium, erroneous detections often to occur. That being so, one measure known in the prior art for reducing the liquid level fluctuations (shaking) is that of providing rib-shaped members inside the cartridge case. This measure, however, requires the case structure to be complex.
  • a suction cap connected to a suction pump is used to cover the recording head and suck out large amounts of ink from the recording head.
  • the positions of the light emitting element and light receiving element relative to the detection site must be accurately established.
  • the ink cartridge is made so that it can be freely attached to and detached from the recording head so that the user can replace it. The condition in which the ink cartridge is mounted will be slightly different, therefore, every time the user replaces it.
  • ink sometimes travels along the inner walls of the ink chamber holding the ink and reaches the atmosphere connection chamber adjacent to the ink chamber. This ink sometimes also passes through the atmosphere connection hole and leaks to the outside. If the case is transparent or semi-transparent, the case will become unsightly once ink penetrates into the atmosphere connection chamber. If the ink plugs up the atmosphere connection hole, that will impair the supply of ink to the recording head.
  • a type of ink cartridge is also known wherein, inside the ink cartridge case, a first chamber is provided for accommodating the porous material absorbing ink, and a second chamber is provided downstream from the first chamber, such that ink is supplied to the recording head via an ink supply hole from the second chamber.
  • a vacuum pack such as is described in the foregoing, furthermore, in order to maintain the interior thereof at reduced pressure for extended periods of time, it is necessary that there be space between the ink cartridge and the packaging bag of the pack, which space has a higher degree of vacuum than the interior of the ink cartridge. Supposing that a substantially rectangular ink cartridge is contained in a packaging bag, and that the packaging bag adheres tightly to the cartridge, outside air that gradually penetrates through the packaging bag will relatively quickly fill the slight gap between the packaging bag and the ink cartridge, making it difficult to maintain the reduced pressure condition for any extended period of time. Japanese Patent Application Laid-Open No.
  • H10-250111/1998 discloses a cartridge wherein, in order to secure a prescribed volume for the reduced pressure space, the exterior shape is not made a simple rectangle but rather is made so that a part thereof projects, thus forming a space alongside the projecting part where the packaging bag does not tightly adhere. With this cartridge, holes are sometimes opened in the packaging bag by the cartridge corners.
  • art is disclosed for inserting other components (spacers) inside the packaging bag such as corrugated cardboard or urethane foam which contain air internally and through which air readily passes.
  • JP 10000787A considers the need to perform stable printing by restricting air having flowed into a cartridge through a venting hole from being introduced into an ink feeding hole through the gap between an ink holding ember and the inner wall of the cartridge when the ink is rapidly fed into a recording head. It proposes an ink cartridge having a constitution wherein an ink feeding hole and a venting hole are provided in the cartridge and an ink storing part for storing the ink and a holding member storing part wherein an ink holding member for holding the ink is stored are provided in the cartridge.
  • the holding member storing part is separated into the first storing part for storing the ink holding member between the ink storing part and the ink feeding hole and the second storing part for storing the ink holding member between the ink storing part and the venting hole.
  • a first object thereof is to provide an ink cartridge wherewith bringing a filling apparatus and a pressure reduction apparatus close to the cartridge package for ink filling is rendered easy, and the operation of applying seals to the case openings is made simple.
  • a second object of the present invention is to provide an ink cartridge wherewith the case can be efficiently filled with ink all the way to the corners thereof, wherewith case deformation due to reduced pressure during filling is prevented, and wherewith filling can be done even more efficiently.
  • a third object of the present invention is to provide an ink cartridge that is made so that the remaining ink quantity can be detected utilizing the space that is for filling the case with ink, which suppresses ink liquid level fluctuation even though the case has a simple structure, and wherewith the remaining ink quantity can be detected accurately.
  • a fourth object of the present invention is to provide an ink cartridge wherewith, even when the liquid level fluctuates rapidly due to ink being drawn out from the recording head, and even when there is variation in the position where the sensor is attached in the recording apparatus, accurate remaining ink quantity detection is made possible.
  • a fifth object of the present invention is to provide an ink cartridge wherein the intrusion of ink to the atmosphere connection hole side from the ink chamber is prevented, and wherein, even when there is a slight occurrence of such ink intrusion, leakage to the outside and blocking of the atmosphere connection hole is prevented.
  • a sixth object of the present invention is to provide an ink cartridge wherewith, when ink is being supplied successively from a first chamber to a second chamber in an ink chamber, air bubbles are not drawn directly into the recording head even when air bubbles intrude into the second chamber, and wherewith ink ejection problems caused by air bubbles are prevented.
  • a seventh object of the present invention is to provide an ink cartridge wherewith the inside of the packaging bag used to hermetically seal the ink cartridge is maintained at reduced pressure for an extended period of time, wherewith there is no particular need for any separate component for forming space for that purpose, and wherewith manufacturing costs can be reduced and achieving smaller size is rendered easy.
  • An eighth object of the present invention is to provide a remaining ink quantity detection method wherewith the remaining ink quantity inside the ink cartridge can be accurately detected.
  • an ink cartridge as defined in appended claim 1.
  • Fig. 1 is a diagram of the ink cartridge according to this embodiment, showing it connected to a recording head.
  • a head holder 50 for supporting the recording head 72 is mounted on a carriage 52 which moves so as to sweep across a recording medium.
  • this holder 50 is loaded the ink cartridge 1 so that it can be detached.
  • An ink supply hole 17 made in the bottom surface of the ink cartridge 1 fits into a joint member 74 on the head holder 50 side, and ink is distributed through a manifold member 73 to many ink ejection channels in the recording head 72.
  • the recording head 72 ejects ink from the ink ejection channels by the action of actuators consisting of piezoelectric elements or heating elements.
  • the ink cartridge 1 comprises a case 2 made in a rectangular shape from a transparent or semi-transparent resin material, and upper and lower cover members 3 and 4.
  • the case 2 consists of a pair of opposing first side walls 2a and 2b, and, connecting between that pair of side walls, a pair of second side walls 2c and 2d (cf. Fig. 2 ) so as to form a rectangular tube open at both the upper and lower ends.
  • the upper and lower cover members 3 and 4 are heat welded so as to cover the open upper and lower tube ends.
  • the case 2 is formed so that it is divided in the interior thereof by partitioning walls 5 and 6 that extend substantially parallel to the first side walls 2a and 2b (the left and right walls in Fig.
  • a bottom partitioning wall 7 that joins the lower ends of those two partitioning walls and extends substantially parallel to the open bottom tube end, and partitioning walls 7a, 7b, and 7c that extend vertically from the bottom partitioning wall 7 toward the bottom open tube end.
  • the partitioning walls 5 and 6, the bottom partitioning wall 7, and the partitioning walls 7a and 7b extend so as to bridge between the second side walls 2c and 2d (cf. Fig. 2 ).
  • first chamber 9 In the space enclosed by the partitioning walls 5 and 6, the bottom partitioning wall 7, and the second side walls 2c and 2d is formed a first chamber 9, the upper face whereof is open at the upper end of the case 2, which accommodates porous material 8 such as polyurethane foam absorbing ink.
  • second chamber 10 In the space enclosed by one of the first side walls 2a, the partitioning wall 5, and the second side walls 2c and 2d is formed a second chamber 10, while in the space enclosed by the other first side wall 2b, the partitioning wall 6, and the second side walls 2c and 2d is formed an atmosphere connection path 11.
  • the second chamber 10 and the atmosphere connection path 11 are each open at their upper ends at the upper surface of the case 2, while the lower ends thereof bend around the lower surface of the bottom partitioning wall and have their lower ends open at the lower surface of the case 2 (cf. Fig. 4 ).
  • the upper cover member 3 covers the upper ends, respectively, of the first chamber 9, the second chamber 10, and the atmosphere connection path 11, and is secured by heat welding to the upper ends of the side walls 2a, 2b, 2c, and 2d and the partitioning walls 5 and 6, making the chambers 9 and 10 and the path 11 independent.
  • the lower cover member 4 covers the lower ends, respectively, of the second chamber 10 and the atmosphere connection-path 11, and is secured by heat welding to the lower ends of the side walls 2a, 2b, 2c, and 2d and the partitioning walls 7a and 7b, making the second chamber 10 and the path 11 independent.
  • the second chamber 10 and the atmosphere connection path 11 substantially constitute an L shape with a vertical part 10a along the side walls 2a and 2b, and horizontal parts 10b and 11b positioned below the first chamber 9.
  • the vertical part 11a and the horizontal part 11b of the atmosphere connection path 11 are connected through a connecting hole 30 provided in the partitioning wall 7b.
  • a connecting hole 15 that connects the first chamber 9 and the second chamber 10. Ink is accommodated in both the first chamber 9 and the second chamber 10, and both of these chambers form the ink chamber.
  • the second chamber 10 serves as a path during ink filling, as is described below, and serves as a relay chamber when ink is being supplied from the- first chamber 9 to the recording head 72.
  • the first chamber 9 is formed such that it is sufficiently larger than the second chamber 10.
  • the atmosphere connection path 11 admits air to the first chamber 9 when ink in the first chamber 9 is consumed. A separation is made between the second chamber 10 and the atmosphere connection path 11 by the partitioning wall 7a at the lower surface of the bottom partitioning wall 7.
  • the partitioning walls 5 and 6 are made substantially parallel with the side walls 2a and 2b on either side of the case 2, rendering the sides in a more or less double-walled structure and strengthening the case.
  • the case 2 shaped in this way can be easily formed of resin by a die that separates vertically up and down.
  • an ink filling hole 13 corresponding with the open face at the upper end of the second chamber 10, and a pressure reduction hole 14 for reducing the pressure inside the case during ink filling, facing the open face at the upper end of the first chamber 9.
  • the connecting hole 15 that mutually connects the second chamber 10 and the first chamber 9 is located at the end that is far from the side on which the ink filling hole 13 and pressure reduction hole 14 are located, that is, on the side opposite thereto, thereby enhancing ink filling efficiency and ink consumption efficiency, as will be described below.
  • the first chamber 9 and the atmosphere connection path 11 are connected by a path 16 formed so as to cross the upper end of the partitioning wall 6 in the upper cover member 3. More specifically, this path 16 has a concavity formed in the upper surface of the upper cover member 3, one end whereof communicates to the first chamber 9 via the pressure reduction hole 14, and the other end whereof communicates with the atmosphere connection path 11 via a through hole 16a.
  • the upper cover member 3 has a wall 27 that is in contact with the upper surface of the porous material 8 projecting into the first chamber 9 (cf. Fig. 4 ). More specifically, the upper cover member 3 is formed so as to be thicker in the portion thereof corresponding with the first chamber 9, so as to slightly compress the ink absorbing material 8.
  • the wall 27 is separated by an interval from the inner surface of the first chamber 9, as will be described below, and the pressure reduction hole 14 is positioned further to the inside of the first chamber 9 than the outer periphery of the wall 27.
  • the connecting hole 15 and the ink supply hole 17 are positioned so as to be mutually offset as seen from the bottom.
  • a rib-shaped baffle plate 31 is formed across the shortest path connecting the connecting hole 15 and the ink supply hole 17.
  • This baffle plate 31 is made to project integrally from the partitioning wall 7 of the case 2, and it is preferable that it be formed so as to join the inner wall surface of the lower cover member 4, but there is no reason why it cannot be made to project integrally from the lower cover member 4.
  • the lower surface 7d of the bottom partitioning wall 7 (cf. Fig. 3 ) forms an inclined surface that rises from the lower end of the connecting hole 15 toward the vertical part of the second chamber 10.
  • One end of the baffle plate 31 is positioned at the side of the connecting hole 15, while the other end thereof extends to a point near the vertical part of the second chamber 10.
  • the ink filling hole 13 and the pressure reduction hole 14, after ink filling, are closed off by first sealing materials 21 and 22 applied to the outer surface of the upper cover member 3 by heat welding or the like.
  • Th sealing material 22 covers the upper surface thereof so as to secure the path 16.
  • the ink supply hole 17 and the atmosphere connection -hole 18 are closed off by a second sealing material 23 that is applied by heat welding or the like such that it can be peeled away.
  • the ink filling hole 13 and the ink supply hole 17 are separated, wherefore the second sealing material 23 is applied to the ink supply hole 17 prior to ink filling.
  • the periphery of the ink supply hole 17 is not wet by ink during filling as with a conventional ink supply hole that doubles as the ink filling hole, wherefore an adequate sealing effect can be obtained even with mild heat welding such as will not deform the ink supply hole.
  • the sealing materials 21 and 22 do not need to be peeled away, wherefore they may be heat welded more strongly even to the point of slightly deforming the upper cover member 3.
  • the sealing materials 21, 22, and 23 are made of a resin, metal foil, or laminated material thereof that is not penetrable by air.
  • a stainless steel screen filter 24 is attached to the face of the ink supply hole 17 on the second chamber 10 side.
  • the screen holes of this filter 24 are of a size such that the ink inside the second chamber 10 will not naturally leak out due to surface tension.
  • a partitioning wall 29 for partitioning the atmosphere connection path 11 into an upper and lower part is formed midway along the vertical part 11a of the atmosphere connection path 11.
  • This -partitioning wall 29 extends so that there are differences in height in the vertical direction of the atmosphere connection path 11.
  • a through hole 28 is formed in the high portion thereof, and a concavity is formed so as to provide an ink sump 29a positioned lower than the upper end surface of the through hole 28.
  • the partitioning wall 29 can be molded with the separating parts of a die that separates vertically up and down when molding the case 2 out of resin, thus requiring no special process.
  • an ink sump 4a is formed about the periphery thereof.
  • a space 33 is formed adjacent to the horizontal parts 10b and 11b of the second chamber 10 and the atmosphere connection path 11.
  • This space 33 is divided by the partitioning wall 7c that bridges between the partitioning walls 7a and 7b, is covered below by the lower cover member 4, and does not communicate with the second chamber 10, the first chamber 9, or the atmosphere connection path 11, but does communicate with the outside of the case through an opening 34 provided in the lower cover member 4.
  • the packaging bag 81 accommodates the ink cartridge 1 inside a tubular material, the interior whereof is evacuated with reduced pressure, and both open ends whereof are given fused closures 82.
  • the packaging bag 81 is made of a resin, metal foil, or laminated material thereof that is not penetrable by air.
  • the cross-section of the ink cartridge 1 diagrammed in Fig. 19 corresponds to a cross-section in-the C-C plane in Fig. 9 .
  • the opening 34 is not covered by the second sealing material 23.
  • Fig. 11, 12 , and 13 show details of the configuration of the path 16 parts.
  • the configuration diagrammed in Fig. 11 is given as a reference for explaining problems.
  • the path 16b is formed so as to pass through the upper cover member 3a, thus mutually communicating between the first chamber 9 and the atmosphere connection path 11.
  • the upper face of the path 16b is covered by the sealing material 22 (not shown).
  • the intersection (ridge line) E1 formed by the partitioning wall 6 and the side walls 2c and 2d, and the intersection E2 formed by the partitioning wall 6 and the upper cover member 3 readily collect ink through capillary action.
  • intersections E1 and E2 are continuous with the intersection E3 formed-by the inner surface of the path 16b and the partitioning wall 6, ink collected at the intersections E1 and E2 flow to the intersection E3 by capillary action, as indicated by the arrow R, and from there flow out along an intersection E4 inside the atmosphere connection path 11.
  • an unsightly condition develops if the case is transparent or semi-transparent, and ink can also leak out to the exterior of the case or plug the atmosphere connection path 11.
  • the ink supply to the recording head 11 from the first chamber 9 is sometimes blocked.
  • an interval K is opened with the inner surface of the first chamber 9 about the periphery of the wall 27 that projects from the upper cover member 3 toward the first chamber 9, as diagrammed in Fig. 12 .
  • the pressure reduction hole 14 is given a circular cylindrical or rounded rectangular shape which does not have intersections on its inner surface, and positioned at the end of the wall 27, removed from the partitioning wall 6.
  • the lower surface of the wall 27, the outer circumference of the wall 27, and the inner surface of the pressure reduction hole 14 are formed so that they do not have inside edge or intersections formed by two planes, and the intersection of the partitioning wall 6 on the first chamber 9 side connects with the atmosphere connection path 11 via these surface portions(flat portions). Accordingly, ink that oozes out when the porous material 8 is compressed by the wall 27 and ink collecting at the intersections on the first chamber 9 side are prevented from flowing out by capillary action to the path 16 or the atmosphere connection path 11.
  • the same effect can be realized by giving the inner surface of the path 16 an edgeless (no intersection) cross-section that has the shape of a semicircular cylinder or rounded rectangle.
  • Fig. 13 is diagrammed an example of the path 16 portion diagrammed in Fig. 12 the structure of which has been modified. With the structure diagrammed in Fig. 13 , the wall 27 has been eliminated, wherefore ink is prevented from rising along that wall to the path 16.
  • a remaining ink quantity detection sensor 60 is provided in the carriage 52 of the ink jet printer. More specifically, while the ink cartridge 1 is in the unused state, ink is filled into the porous material 8 in the first chamber 9 and in the second chamber 10 so that no space is left remaining. When the ink is consumed by a recording operation, however, and the ink in the first chamber 9 is depleted, due to the pressure wherewith the ink is drawn by the recording head 72, air enters the second chamber 10 from the first chamber 9, a gap portion develops at the top of the second chamber 10, and the ink liquid level falls. The remaining ink quantity detection sensor 60 detects whether or not there is a remaining ink quantity from changes in the light reflected according to whether or not ink is present on the inner wall surface of that second chamber 10.
  • the remaining ink quantity sensor 60 is configured, as shown in Fig. 15 , with a light emitting element 61 and a light receiving element 62 provided on either side of a detection site ⁇ , with a prescribed interval opened in the horizontal direction of the second chamber 10, so that the light emitting element 61 emits light at the detection site ⁇ that is established at a prescribed height position on the side wall 2a of the case 2 looking toward the second chamber 10, and so that the light receiving element 62 can capture the light that is reflected from the inner surface of the side wall at that detection site ⁇ (cf. Fig. 5 ).
  • the case 2 need only have that portion at the detection site ⁇ made transparent or semi-transparent in order to secure light transmissivity.
  • the detection site ⁇ is established, as diagrammed in Fig. 15 , at the place (corner) where the ridge line is formed by the intersection of the inner surface of the side wall 2a and the side wall 2d adjacent thereto and extends up and down, inside the second chamber 10 of the ink cartridge 1. If the detection site ⁇ is established thusly at the ridge line (corner) of the second chamber 10, then, as will be described below, when the height of the ink fluid level inside the second chamber 10 falls precipitously from level h1 to level h2, as diagrammed in Fig.
  • the remaining ink quantity at the point in time where the ink cartridge 1 should be replaced can be made extremely small, so that ink waste that occurs when the ink cartridge 1 is replaced can be held to a minimum.
  • many finely undulating ribs 63 are formed on the inner surface of the side wall 2a looking into the second chamber 10 where the detection site ⁇ is established in a direction perpendicular to the plane containing the light emitting element 61, the light receiving element 62, and the detection site ⁇ , that is, in the vertical up and down direction of the ink cartridge 1, while on the outer surface of the side wall 2a where the detection site ⁇ is established, many finely undulating ribs 64 are formed in a direction parallel to the plane containing the light emitting element 61, the light emitting element 62, and the detection site ⁇ , that is, in the fore-and-aft direction of the ink cartridge 1.
  • the light emitted from the light emitting element 61 when reflected by the inner surface of the side wall 2a of the case 2, is scattered in a substantially horizontal direction (i.e. in a direction parallel to the plane containing the light emitting element 61, the light emitting element 62, and the detection site ⁇ ) by the undulating ribs 63, and advances toward the light emitting element 62 while spreading out in the plane containing the light emitting element 61 and the light emitting element 62 of the sensor 60 and the detection site ⁇ on the case 2.
  • the light reflected when no such undulating ribs are formed on the inner surface of the side wall 2a is indicated by the double-dotted lines in the same figure.
  • the light emitting element 62 can capture the reflected light in a definite way even when there are slight changes in the distance between the sensor 60 and the detection site ⁇ .
  • the remaining ink quantity can be detected unambiguously.
  • the light is represented as being emitted from the light emitting element 61 in a parallel state, but the same benefit can be realized even if the light is emitted so that it spreads.
  • the light that is reflected at the outer surface of the side wall 2a of the case 2 is scattered vertically upward and downward by the undulating ribs 64, and the light reflected at the outer surface of the side wall 2a proceeds toward the light emitting element 62 while spreading outside of the plane containing the light emitting element 61 and light emitting element 62 of the sensor 60 and the detection site ⁇ , wherefore it becomes difficult for the light emitting element 62 to capture that light that is reflected at the outer surface of the side wall 2a which does not contribute to the detection of the remaining ink quantity.
  • the proportion of those components of the light reflected by the inner surface of the side wall 2a that do contribute to remaining ink quantity detection becomes high, whereupon remaining ink volume detection precision is enhanced.
  • the undulating ribs on the inner face of the side wall 2a extend in the horizontal direction, light would be scattered vertically up and down, wherefore, when the distance between the sensor 60 and the detection site ⁇ has changed, as diagrammed in Fig. 16 , the allowable position whereat the light emitting element 62 can capture the reflected light would significantly more limited than in the embodiment described above.
  • the case 2 configured as described in the foregoing is formed in a die.
  • the die face corresponding to the inner surface of the side wall 2a where the detection site ⁇ is established is polished in a direction perpendicular to the plane containing the light emitting element 61, the light emitting element 62, and the detection site ⁇
  • the die face corresponding to the outer surface of the side wall 2a where the detection site ⁇ is established is polished in a direction parallel to the plane containing the light emitting element 61, the light emitting element 62, and the detection site ⁇ .
  • an ink cartridge 1 can be easily manufactured wherein many undulating ribs 63 and 64 are formed in the prescribed directions on the inner surface and outer surface, respectively, of the side wall 2a where the detection site ⁇ is established.
  • the light emitting element 61 and the light emitting element 62 are positioned in a horizontal orientation, but this does not constitute a limitation, and it is possible to position the light emitting element 61 and the light emitting element 62 in the vertical dimension of the ink cartridge 1. In that case, however, the orientations of the undulating ribs 63 and 64 formed in the inside and outside surfaces of the side wall 2a, respectively, must be reversed.
  • the method of fabricating the ink cartridge 1 is described next.
  • the case 2 is first molded out of resin, then washed and dried. At this time, both the upper and lower faces of the case 2 are open, wherefore the case 2 can be easily molded with a die that separates up and down.
  • the case must be washed well so that the ink properties do not change, but, with this case shape, the washing liquid readily reaches into the interior portions, so washing can be done easily. Drying can also be performed so that no washing liquid remains.
  • the porous material 8 is inserted into the first chamber 9 from the upper open end of the case 2.
  • This porous material 8 is accommodated in a compressed condition because the upper cover member 3 pushes against it.
  • the upper cover member 3 is heat welded around the lip of the upper opening in the case 2 and at the upper ends of the partitioning walls 5 and 6.
  • the lower cover member 4 is secured by heat welding around the lip of the lower opening in the case 2 and at the lower ends of the partitioning walls 7a, 7b, and 7c.
  • a sealing material 23 which can be peeled away, for covering them.
  • the various types of chamber described earlier can be formed, making the assembly thereof easy.
  • the ink supply hole 17 and the atmosphere connection hole 18 are lined up on one side of the cartridge, wherefore the sealing material 23 for covering these can be applied easily, without the need of being pulled around the outer periphery of the cartridge as conventionally.
  • the pressure in the first and second chambers 9 and 10 is thereby reduced, whereupon the ink passes from the ink filling hole 13 through the second chamber 10 and the connecting hole 15 and thus fills the porous material 8 inside the first chamber 9.
  • the second chamber 10 becomes an ink filling path.
  • the ink enters the second chamber 10 from one end, passes through the connecting hole 15 that is maximally separated therefrom, and enters the first chamber 9, after which it reaches the pressure reduction hole 14 that is maximally separated from the connecting hole 15, wherefore the second chamber 10 itself can be completely filled with ink, while, at the same time, the first chamber 9 can also be efficiently filled with ink.
  • the outside of the case 2 is a reinforced double-walled structure, wherefore the case 2 will not be deformed very much during pressure reduction, for which reason also the two chambers 9 and 10 can be efficiently filled with ink.
  • the pressure in the atmosphere connection path 11 is also reduced simultaneously with the first chamber 9, and the reduced pressure state is maintained even after the sealing material is applied.
  • ink for the ink loaded by this process, ink (so-called deaerated ink) is used from which bubbles and air dissolved therein has been removed to the extent possible.
  • deaerated ink used from which bubbles and air dissolved therein has been removed to the extent possible.
  • the purpose of this is to avoid ink ejection problems that arise when bubbles and air penetrate into the recording head 72.
  • the ink cartridge is hermetically sealed under reduced pressure in the packaging bag 8, as described earlier, in order to prevent bubbles and air from again being dissolved in the deaerated ink.
  • sealing materials 21 and 22 are applied to the ink filling hole 13 and the pressure reduction hole 14.
  • the sealing materials 21 and 22 may be applied in a single strip if, afterwards, only the necessary portions are left remaining.
  • the filling apparatus 101 and the pressure reduction apparatus 102 need only be brought up against the case 2 from one side, and the seals need be only applied from one side of the case 2 also, making for efficient operations.
  • the ink cartridge 1 fabricated in this manner is shipped after being hermetically sealed under reduced pressure inside the packaging bag 81, as described earlier.
  • the user peels away the sealing material 23 applied to the ink supply hole 17 and the atmosphere connection hole 18 of the ink cartridge 1, and couples the ink supply hole 17 via the joint member 74 to the manifold 73 in the recording head 72. Then a suction cap is connected to the recording head 72 and the recording head 72 is filled with ink from the ink cartridge 1, as is commonly known.
  • a negative pressure is caused to act on the ink supplied to the recording head from the second chamber 10.
  • the actuators in the recording head 72 perform an ink ejecting action, thereby producing a negative pressure in the ejection direction and drawing out ink from the ink cartridge 1.
  • the first chamber 9 atmospheric air is drawn in from the side distant from the connecting hole 15, so that not only is the ink in the first chamber 9 utilized effectively, but all of the ink, including the ink that is in the second chamber 10; is used effectively. Also, because the second chamber 10 is completely filled from the beginning as an ink filling path, during remaining ink quantity detection, detection errors will not be made due to inadequate ink filling here. The operation of removing the sealing material 23 is also easy because it is done only on one side of the cartridge.
  • the ceiling surface of the horizontal part 10b of the second chamber 10, that is, the lower surface 7d of the bottom partitioning wall 7, is inclined so that it rises from the lower end of the connecting hole 15 toward the vertical part 10a of the second chamber 10, wherefore air and bubbles do not become trapped at the lower surface of the bottom partitioning wall 7 but rather flow toward the top of the vertical part 10a. That being so, bubbles and air can be prevented from penetrating to the recording head 72 and causing ink ejection failures.

Landscapes

  • Ink Jet (AREA)

Claims (8)

  1. Tintenpatrone (1) zum Halten von Tinte zum Liefern an einen Aufzeichnungskopf, mit:
    einem Gehäuse (2) mit einem ersten offenen Ende, einem zweiten offenen Ende gegenüber dem ersten offenen Ende und einer Seitenwand (2b), die sich von dem ersten offenen Ende zu dem zweiten offenen Ende erstreckt;
    einer Tintenkammer (9) zum Halten der Tinte, die in dem Gehäuse (2) gebildet ist;
    einem Atmosphärenverbindungspfad (1), der sich entlang der Seitenwand (2b) auf solch eine Weise erstreckt, dass ein Ende des Atmosphärenverbindungspfades (11) sich an dem ersten offenen Ende befindet und das andere Ende des Atmosphärenverbindungspfades (11) sich an dem zweiten offenen Ende befindet;
    einer ersten Wand (3) zum Bedecken des ersten offenen Endes des Gehäuses (2) mit einem Pfad (14, 16, 16a), der zum Kommunizieren zwischen der Tintenkammer (9) und dem Atmosphärenverbindungspfad (11) gebildet ist; und
    einer zweiten Wand (4) zum Bedecken des zweiten offenen Endes des Gehäuses (2), wobei die zweite Wand ein Tintenlieferloch (17) und ein Atmosphärenverbindungsloch (18) aufweist, das Tintenlieferloch (17) mit dem Aufzeichnungskopf zu verbinden ist, der an der zweiten Oberfläche gebildet ist, so dass es mit der Tintenkammer (9) kommuniziert, und das Atmosphärenverbindungsloch (18) mit dem anderen Ende des Atmosphärenverbindungspfades (11) derart kommuniziert, dass das andere Ende des Atmosphärenverbindungspfades (11) mit der Außenseite des Gehäuses an dem zweiten offenen Ende kommuniziert.
  2. Tintenpatrone (1) nach Anspruch 1, weiter mit:
    einer Trennwand (5, 6, 7) zum Unterteilen des Inneren des Gehäuses (2) in die Tintenkammer (9) zum Halten der Tinte und den Atmosphärenverbindungspfad (11).
  3. Tintenpatrone nach Anspruch 1 oder 2, weiter mit:
    einem Abdichtmaterial (23), das sowohl das Tintenlieferloch (17) als auch das Atmosphärenverbindungsloch (18) bedeckt, wobei das Abdichtmaterial (23) abgezogen werden kann.
  4. Tintenpatrone nach einem der vorhergehenden Ansprüche, bei der der Pfad durch einen konkaven Abschnitt (16) an der ersten Wand (3), ein erstes Loch (14), das den konkaven Abschnitt (16) und die Tintenkammer (9) verbindet, und ein zweites Loch, das den konkaven Abschnitt (16) und den Atmosphärenverbindungspfad (11) verbindet, gebildet ist.
  5. Tintenpatrone (1) nach Anspruch 4, bei der der konkave Abschnitt (16) auf einer Außenseitenoberfläche der ersten Wand (3) gebildet ist, die erste Wand (3) ein erstes Abdichtmaterial (22) aufweist, das den konkaven Abschnitt (16) bedeckt.
  6. Tintenpatrone nach einem der vorhergehenden Ansprüche, bei der
    das Gehäuse (2) ein Inneres zwischen dem ersten offenen Ende und dem zweiten offenen Ende aufweist, wobei das Innere des Gehäuses (2) in eine erste Kammer (9), die die Tintenkammer (9) bildet, eine zweite Kammer (10) und den Atmosphärenverbindungspfad (11) unterteilt, wobei die erste Kammer (9) mit der zweiten Kammer (10) an dem zweiten offenen Ende des Gehäuses (2) kommuniziert,
    wobei das Tintenlieferloch (17) mit der zweiten Kammer (10) kommuniziert und der Atmosphärenverbindungspfad (11) mit der Außenseite des Gehäuses (2) an einer Position kommuniziert, die benachbart zu dem Tintenlieferloch (17) ist.
  7. Tintenpatrone (1) nach Anspruch 2, weiter mit:
    einer Trennwand, die das Innere des Gehäuses (2) in die erste Kammer (9) und die zweite Kammer (10) unterteilt.
  8. Tintenpatrone (2) nach einem der vorhergehenden Ansprüche, weiter mit:
    einem Tintensumpf (29a, 4a), der in dem Atmosphärenverbindungspfad (11) gebildet ist.
EP02029048A 1998-03-30 1999-03-30 Tintenpatrone und Verfahren zur Detektion der restlichen Tintenmenge Expired - Lifetime EP1300248B1 (de)

Applications Claiming Priority (23)

Application Number Priority Date Filing Date Title
JP8403798 1998-03-30
JP8403798 1998-03-30
JP9477898 1998-04-07
JP9477398 1998-04-07
JP9477798 1998-04-07
JP9477798 1998-04-07
JP9477398 1998-04-07
JP9477698 1998-04-07
JP9477298 1998-04-07
JP9477498 1998-04-07
JP9477298 1998-04-07
JP9477498 1998-04-07
JP9477598 1998-04-07
JP9477598 1998-04-07
JP9477698 1998-04-07
JP9477898 1998-04-07
JP14699398 1998-05-28
JP14699398 1998-05-28
JP16692098 1998-06-15
JP16692098 1998-06-15
JP2832099 1999-02-05
JP11028320 1999-02-05
EP19990302481 EP0947328B1 (de) 1998-03-30 1999-03-30 Tintenpatrone und Verfahren zur Detektion der restlichen Tintenmenge

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
EP19990302481 Division EP0947328B1 (de) 1998-03-30 1999-03-30 Tintenpatrone und Verfahren zur Detektion der restlichen Tintenmenge

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EP1300248A2 EP1300248A2 (de) 2003-04-09
EP1300248A3 EP1300248A3 (de) 2007-01-24
EP1300248B1 true EP1300248B1 (de) 2008-10-22

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EP19990302481 Expired - Lifetime EP0947328B1 (de) 1998-03-30 1999-03-30 Tintenpatrone und Verfahren zur Detektion der restlichen Tintenmenge
EP02029048A Expired - Lifetime EP1300248B1 (de) 1998-03-30 1999-03-30 Tintenpatrone und Verfahren zur Detektion der restlichen Tintenmenge
EP02029049A Expired - Lifetime EP1300249B1 (de) 1998-03-30 1999-03-30 Tintenpatrone und Verfahren zur Detektion der restlichen Tintenmenge

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JP2002292890A (ja) * 2001-03-30 2002-10-09 Brother Ind Ltd インクカートリッジ
JP3331976B2 (ja) * 1998-07-30 2002-10-07 カシオ計算機株式会社 インクカートリッジ
JP3387886B2 (ja) * 1999-04-26 2003-03-17 キヤノン株式会社 インクジェット記録装置
EP1849608B1 (de) 2000-01-21 2010-04-21 Seiko Epson Corporation Tintenpatrone und Tintenstrahldruckvorrichtung mit einer derartigen Tintenpatrone
DE60135045D1 (de) 2000-01-21 2008-09-04 Seiko Epson Corp Tintenstrahlaufzeichnungsgerät
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EP1808298A1 (de) * 2006-01-16 2007-07-18 Seiko Epson Corporation Flüssigkeitsbehälter
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EP2397331B1 (de) 2010-06-17 2014-07-23 Brother Kogyo Kabushiki Kaisha Satz von Tintenpatronen
JP5565329B2 (ja) * 2011-01-26 2014-08-06 セイコーエプソン株式会社 液体噴射装置に装着される液体収容容器
JP6060544B2 (ja) * 2012-05-23 2017-01-18 セイコーエプソン株式会社 液体収容体、及び、収容体ユニット
JP6069964B2 (ja) 2012-07-23 2017-02-01 セイコーエプソン株式会社 カートリッジの製造方法、注入キット、及び、注入装置
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US10384454B2 (en) 2012-07-23 2019-08-20 Seiko Epson Corporation Refilled cartridge and method for manufacturing refilled cartridge
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Publication number Publication date
EP1300248A3 (de) 2007-01-24
EP0947328B1 (de) 2005-12-07
EP1300249B1 (de) 2008-10-22
EP1300249A2 (de) 2003-04-09
EP1300248A2 (de) 2003-04-09
EP1300249A3 (de) 2007-01-24
EP0947328A2 (de) 1999-10-06
EP0947328A3 (de) 2000-05-10

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