CA2675489C

CA2675489C - Ink cartridge

Info

Publication number: CA2675489C
Application number: CA2675489A
Authority: CA
Inventors: Shingo Hattori; Hiroto Sugahara
Original assignee: Brother Industries Ltd
Current assignee: Brother Industries Ltd
Priority date: 2008-03-25
Filing date: 2008-03-25
Publication date: 2015-06-23
Anticipated expiration: 2028-03-25
Also published as: AU2008348977B2; AU2008348977B8; WO2009118913A1; AU2008348977A8; CA2675489A1; AU2008348977A1

Abstract

An ink cartridge includes a case, an ink supply portion positioned at a front face of the case, a movable member configured to move relative to the case, and at least one resilient member coupled to a rear face of the case and the movable member. The at least one resilient member is configured to expand in an expansion direction and to contract in a contraction direction to move the movable member relative to the case, and a shape of the case in the expansion and contraction directions is unaltered. The entire moveable member is configured to substantially simultaneously move relative to the case when the at least one resilient member expands and contracts.

Description

DESCRIPTION
INK CARTRIDGE
Technical Field [0001] The present invention relates generally to an ink cartridge. In particular, the present invention is related to an ink cartridge which is configured to dispense ink when mounted in a printer.
Background Art

[0002] A known ink cartridge is configured to be mounted to i mounting portion of a Imown recording apparatus, such as an ink jet recording apparatus. The known ink cartridge has an ink chamber configured to store ink therein, a wall defining at least a portion. of the ink chamber, and an ink supply portion positioned at the wall, which is configured to supply ink from the interior of the ink chamber to the exterior of the ink chamber. The ink supply portion extends outwardly from the wall. A
resilient member is disposed within the ink supply portion. When the knowa ink cartridge is dropped and collides with a surface, such as a floor, a portion of the impact of the collision may be absorbed by the resilient member. Such a known ink cartridge is described in JP-A-2001-71522, for example.

[0003] Nevertheless, because the resilient member is disposed within the ink supply portion an outer portion of the ink supply portion may be damaged when the ink supply portion contacts the surface, which may cause ink to leak from the ink supply portion. Moreover, if the ink cartridge contacts the surface at a position other than the ink supply portion, the ink cartridge may be damaged, and ink may leak from the ink cartridge.

[0004] Another known ink cartridge is configured to be mounted to an accommodating chamber of the known recording apparatus, and the accommodating chamber includes a door which is configured to be opened and closed. After the known ink cartridge is mounted to the accommodating chamber and the door is closed, the door' may latch on to the ink cartridge to .remove the ink cartridge from the accommodating chamber when the door is opened by a user, which increases the ease With which the ink cartridge may be removed from the accommodating chamber.
Such i a known ink cartridge is described in US 2007/0070140 Al for example, Nevertheless, the user relies on the recording apparatus to remove the ink cartridge from the recording apparatus.
Disclosure of the Invention

[0005] Therefore, a need has arisen for an ink cartridge which overcome these and other shortcomings of the related art. A technical advantage of the present invention is that the ink cartridge may be protected from damage when the ink cartridge contacts the surface. Another teclnical advantage of the present invention is that the ink cartridge readily may be removed from the recording apparatus.

[0006] According to an embodiment of the present invention, an ink cartridge comprises a case, an ink supply portion, a movable member, and at least one resilient member. The case has at least a portion of an ink chamber defined therein, and the ink chamber is configured to store ink. Moreover, the case has a front face and a rear face opposite the front face. The ink supply portion is positioned at the front face of the case, and the ink supply portion is configured to dispense ink from at interior of the ink chamber to an exterior of the ink chamber. The movable member is configured to move relative to the case. The. at least one resilient member has a first end which is coupled to the rear of the case, and a second end which is coupled to the movable member. Moreover, the at least one resilient member is configured to expand in an expansion direction and to contract in a contraction direction opposite the expansion direction to move the movable member relative to the case, and a shape of the case in the expansion and contraction directions is unaltered when the at least one resilient member expands and contracts. The entire moveable member is configured to substantially simultaneously move in a first direction relative to the case when the at least one resilient member expands, and the entire moveable member is configured to substantially simultaneously move in a second direction opposite the first direction when the at least one resilient member contracts.

[0007] With this configuration, ink cartridge is protected from damage when the ink cartridge contacts a surface. Moreover, ink cartridge is readily removed from a recording apparatus.

[0008] At least one portion of the movable member may extend adjacent to and away from the front face of the case in the second direction. Moreover, the ink supply portion may extend from the front face of the case in the second direction, and the at one portion of the movable member may extend fuuther from the front face of the' case in the second direction than the ink supply potion extends from the front face of the case in the second direction. With this conftgm:ation, ink supply portion may not contact the surface and may be protected from the damage.

[0009] The ink cartridge may further comprise a translucent portion positioned at the front face of the case and extending away from the ink chamber, and the translucent portion may have an inner space formed therein, and the inner space may be configured to be in fluid communication with the ink chamber The ink cartridge also may comprise a further movable member positioned within the inner space, and the further movable member may be configured to move within the inner space based on an amount of ink in the ink chamber. Moreover, each of the ink supply portion and the translucent portion may extend from the front face of the case in the second.
direction, and the at least one portion of the movable member may extend further from the fro-at face of the case in the second direction than each of the ink supply portion and the translucent portion extends from the front face of the case in the second direction.
With this conf guration, each of the ink supply portion and the translucent portion may not contact the surface and may be protected from the damage.

[0010] The case may finther comprise a particular face connected to each of the front face and the rear face, and the movable member may comprise a first portion and a second portion extending from the first portion in the second direction.
The at least one resilient member may be coupled to the first portion of the movable member, and the second portion of the movable member may engage the particular face and extends away from the front face in the second direction. Moreover, the ink supply portion may extend from the front face of the case in the second direction, and the second portion of the movable member may extend further from the front face of the case in the second direction than the ink supply portion extends from the front face of the case in the second direction. With this configuration, ink supply portion may not contact the surface and may be protected from the damage.
10011] The in cartridge may further comprise a translucent portion positioned at the front face of the case and extending away from the ink chamber, the translucent portion may have an inner space formed therein and the inner space may be configured to be in fluid communication with the ink chamber. The ink cartridge also may comprise a further movable member positioned within the inner space, and the further movable member may be configured to move within the inner space based on an amount of ink in the ink chamber. Moreover, each of the ink supply portion and the translucent portion may extend from the front face of the case in the second direction, and the second portion of the movable member may extend further from the front face of the case in the second direction than each of the ink supply portion and the translucent portion extends from the front face of the case in the second direction.
With this con- figuration, each of the ink supply portion and the translucent portion may not contact the surface and may be protected from the damage.
10012] The case may further comprise a particular face connected to each of the front face and the rear face, and a further face opposite the particular face and connected to each of the front face and the rear face. The movable member may comprise a first portion, a second portion extending from the first portion in the second direction, and a third portion extending from the first portion in the second direction.
The at least one resilient member may be coupled to the first portion of the movable member, the second portion of the movable member may engage the particular face and extend away from the front face in the second direction, and the third portion of the movable member may engage the further face and extend away from the front face in the second direction. The ink supply portion may extend from the front face of the case is the second direction, and each of the second portion and the third portion of the movable member may extend further from the front face of the case in the second direction than the ink supply portion extends from the front face of the case in the second direction. With this configuration, ink supply portion may not contact the surface and may be protected from the damage.
[0013] The ink cartridge fray further comprise a translucent portion positioned at the front face of the case and extending away from the ink chamber, and the translucent portion may have an inner space formed therein, and the inner space may be configured to be in fluid communication with the ink chamber. The, ink cartridge may comprise a further movable member positioned within the inner space, and the further movable member may be configured to move within the inner space based on an, amount of ink in the ink chamber. Each of the ink supply portion and the -translucent portion may extend from the front face of the case in the second direction, and each of the second portion and the third portion of the movable member may extend further from the front face of the case in the second direction than each of the ink supply portion and the translucent portion extends from the front face of the case in the second direction.

[0014] Other objects, features, and advantages of embodiments of the present invention will be apparent to persons of ordinary skill in the art from the following description ofpreferred embodiments with reference to the accompanying drawings.
Brief Description of Drawings [0015] For a more complete understanding of the present invention., the needs satisfied thereby, and the objects, features, and advantages thereof, reference now is made to the following description taken in connection with the accompanying drawings.
10016] Fig. 1 is a perspective view of a multi-function device, according to an embodiment of the present invention.
[0017] Figs. 2(a)-2(d) are a front view, a side view, a rear view, and a bottom view, respectively, of an ink cartridge according to an embodiment of the present invention.
[0018] Fig. 3(a) is a front view of a case of the ink cartridge of Figs.
2(a)-2(d).
[0019] Fig. 3(b) is a cross-sectional view of the case taken along the line IlZb-IITb of Fig. 3 (a).

[0020] Fig, 4 is a perspective view of a movable member of the ink cartridge of Figs. 2(a)-2(d), [0021] Figs. 5(a) is a schematic depicting the ink cartridge of Figs. 2(a)-2(d) when colliding with a surface, in which a third plate portion of the movable member faces downward..
[0022] Figs. 5(b) is another schematic depicting the ink cartridge of Figs.
2(a)-2(d) when colliding with a surface, in which the third plate portion of the movable member faces downward.
[0023] Figs. 6(a) is a schematic depicting the ink cartridge of Figs, 2(a)-2(d) when colliding with a surface, in which a front face of the case faces downward.
[0024] Figs. 6(b) is another schematic depicting the ink cartridge of Figs.
2(a)-2(d) when colliding with a surface, in which a front face of the case faces downward.
[0025] Fig. 7 is a cross-sectional view of a cartridge accommodating case, according to an embodiment of the present invention.
[0026] Fig, 8 is a cross-sectional view of the ink cartridge of Figs. 2(a)-2(d) mounted to the cartridge accommodating case of Fig. 7, in which a lock lever is in an open position.
[0027] Fig. 9 is a cross-sectional view of the ink cartridge of Figs. 2(a)-2(d) mounted to the cartridge accommodating case of Fig. 7, in which a look lever is in a closed position.
[0028] Fig, 10 is a perspective view of an ink cartridge, according to another embodiment of the present invention.
[0029] Figs. 11(a) and 11(b) are a front view and a side view, 'respectively, of an ink cartridge, according to yet another embodiment of the present invention.
[0030] Figs. 12(a) and 12(b) are a side view and a rear view, respectively, of an ink cartridge, according to still another embodiment of the present invention.
[00311 Figs. 13(a) and 13(b) are a side view and a rear view, respectively, of the ink cartridges of Fig. 12(a) and 12(b), in which four ink cartridges are positioned side by side.
[0032] Fig. 14 is a cross-sectional view of the ink cartridge of Figs.
12(a)-12(b) mounted to a cartridge accommodating case, in which a lock lever is in an open position.

[0033] Trig. 15 is a cross-sectional, view of the ink cartridge of Pigs.
12(a)-12(b) mounted to the cartridge accommodating case, in which a lock lever is in a closed position.
Explanation of Reference 30 ink cartridge 32 case 33 movable member 34 coil spring 36 ink chamber 39 translucent portion 50 aix intake hole 51 ink supply portion 60 pivotable member Best Mode for Carrying Out the Invention [0034] Embodiments of the present invention and their features and technical.
advantages may be understood by referring to rigs. 1-15, like numerals being used for like corresponding portions in the various drawings.
[0035] Referring to Fig. 1 a multi-function device 10 configured to be used with an ink cartridge 30 according to an embodiment of the invention is depicted.
Multi-function device 10 comprise s a printer portion 12 at the bottom and a scanner portion 13 at the top. Scanner portion 13 comprises an automatic sheet feeder 15.
Multi-function device 10 is configured to be connected to a computer or another external device, e.g., a digital camera, When printing data is transmitted to printer portion 12 from the computer, the external device, or scanner portion 13, printer portion 12 prints an image on a sheet of paper based on the printing data.
[0036] Multi-function device 10 has a substantially rectangular parallelepiped shape having a width, a depth, and a height. Each of the width and the depth is greater than the height. Printer portion 12 comprises a case 14, and case 14 has an opening 17 formed therethrough at, a center of a front face of case 14. A tray (not shown) configured to accommodate sheets of paper is disposed in case 14, and the tray is configured to be removed from the interior of case 14 through opening 17. Case also has an opening 18 formed theretbrough at a position adjacent to an end of the front face of case 14 in the width direction of multi-function device 10. Multi-functional device 10' also comprises a cartridge accommodating portion 100 positioned in case 14, and cartridge accommodating portion 100 is exposed to the exterior of case 14 through opening 18. Cartridge accommodating portion 100 comprises a plurality of, e.g., four, cartridge accommodating cases 101, each of which is configured to accommodate art ink cartridge 30 therein. Each ink cartridge 30 stores ink therein, e.g., each ink cartridge 30 stores a different color of ink therein. For example, a first ink cartridge 30 stores black ink therein, a second ink cartridge 30 stores yellow ink therein, a third ink cartridge 30 stores cyan ink therein, and a fourth ink cartridge stores magenta ink 'therein. The plurality of cartridge accommodating cases 101 are aligned in the width direction of multi-function device 10.
10037] Multi-function device 10 comprises a door 20, and the lower end of door 20 is coupled to case 14 below opening 18, such that door 20 is configured to pivot about the lower end of door 20. Door 20 is configured to expose cartridge accommodating portion 100 through opening 18 when door 20 is opened, and to cover opening 18 when door 20 is closed.

[0038] Referring to Figs. 2-4, ink cartridge 30 comprises a case 32, a movable member 33, and a resilient member, e,g., a coil spring 34. Case 32 and movable member 33 are coupled via coil spring 34, and movable member 33 is configured to move relative to case 32, e.g., to slide on case 32, when coil spring 34 expands in an expansion direction and contracts' in a contraction direction which is opposite the expansion direction. For example, a first end of coil spring 34 is coupled to case 32, and a second end of coil spring 34 is coupled to movable member 33, Coil spring 34 may be coupled to case 32 by direct contact or by indirect contact therebetween, and coil spring may be coupled to movable member 32 by direct contact or by indirect contact therebetween. When coil spring 34 is indirectly connected to case 32, at least one element is positioned between coil spring 34 and case 32. Similarly, when coil spring 34 is indirectly connected to movable member 33, at least one element is positioned between coil spring 34 and movable member 33.
[0039] Case 32 has a substantially rectangular parallelepiped shape having a front face 40, a rear face .42 opposite front face 40, a top face 41, a bottom face 43 opposite top face 41, and side faces 44 opposite each other. Each of top face 41 and bottom face 43 is connected to front face 40 and rear face 42, and each of side faces 44 is connected to front face 40, rear face 42, top face 41, and bottom face 43.
Each of front face 40, top face 41, rear face 42, bottom face 43, and side faces 44 is substantially parallel to its opposing face, and substantially perpendicular to the other faces. Case 32 has a width from one of side faces 44 to the other of side faces 44, a depth from front face 40 to rear face 42, and a height from top face 41 to bottom face 43. The height of case 32 is greater than the width of case 32, and the depth of case 32 is greater than the height of case 32. Case 32 comprises an ink chamber 36 formed therein, and ink chamber 36 is configured to store ink. Case 32 comprises at least one translucent resin material, e.g., a transparent resin material or a semi-transparent resin material, which allows light to pass therethrough..
[0040] In an embodiment, a shape of case 32 in the expansion and contraction directions is not altered when coil spring 34 expands and contracts. The entire moveable member 33 is configured to substantially simultaneously move in a first direction relative to case 32 when coil spring 34 member expands, and the entire moveable member 33 is configured to substantially simultaneously move relative to case 32 in a second direction opposite the first direction when coil spring 34 contracts, [0041] Case 32 comprises a translucent portion 39, and rails 55 and 56 at top face 41 and bottom face 43, respectively, A pivotable member 60 is pivotally disposed within ink chamber 36. Translucent portion 39 is positioned at front face 40 and extends away from ink chamber 36. The translucent portion 39 is integral with one 32, and comprises the same material as frame 32. When ink cartridge 30 is installed in multi-function device 10, translucent portion 39 is irradiated with light emitted from a sensor 103 of multi-function device 10.

[0042] In an embodiment, those portions of case 32 other than translucent portion 39 may be covered with an opaque member to avoid the deterioration of ink i 10 disposed in ink chamber 36 due to exposure to ultraviolet radiation. In another embodiment, case 32 may comprise a frame which comprises front face 40, top face 41, rear face 42, and bottom face 43, and each of side faces 44 may comprise a film connected to, e.g., adhered to, the frame, such as by welding.

[0043] Translucent portion 39 projects outward from a center portion of front face 40 of case 32 in a direction away from ink chamber 36. Translucent portion 39 is defined by five rectangular walls and has an inner space 46 foamed therein which has a substantially a hollow box shape. For example, translucent portion 39 is defined by a front wall, a pair of side walls, a top wall, and a bottom wall 47. The front wall extends parallel to front face 40 and is separated from front face 40 by a predetermined distance. The pair of side walls is connected to front face 40 and the front wall, the top wall is connected to the top ends of the front wall and the side walls, and bottom wall 47 is connected to bottom ends of the front wall and the side walls. Moreover, the width of the front wall is less than the width of front face 40.
[0044] Inner space 46 of translucent portion 39 is configured to be ixi fluid communication with ink chamber 36, e.g., there is no wall positioned between inner space 46 and ink chamber 36. An indicating portion 62 of the pivotable member 60 is configured to move within inner space 46, e.g., between a first position and a second position within inner space 46. For example, when indicating portion 62 is at the first position, indicating portion 62 contacts bottom wall 47 of translucent portion 39, as indicated by a solid line in Fig. 3 (b), and when indicating portion 62 is positioned at the second position, indicating portion 62 is separated form bottom wall 47 of translucent portion 39, as indicated by a dotted line in Fig. 3(b).
[0045] Pivotable member 60 is used to determine whether the amount of ink stored in the ink chamber 36 is greater than or equal to a s'ufcient amount of ink Pivotable member 60 comprises indicating portion 62 at one end thereof, and a float portion 64 at the other end thereof. Pivotable member 60 also comprises a shaft 66 which is connected to indicating portion 62 and float portion 64. Shaft 66 extends in the width direction of case 32, and shaft 66 is supported by supporting portions disposed on inner surfaces of walls defining side faces 44; respectively, such that pivotable l I

11 member 60 pivots about shaft 66 in directions indicated by arrows 67 and 68 in Fig.
3(b).
[0046] The specific gravity of float portion 64 is less than the specific gravity of ink stored in the ink chamber 36. Float portion 64 has a hollow formed therein, and floats on liquid, such that the float portion 64 moves upward and downward based on the amount of ink within the ink chamber 36, and pivotable member 60 pivots based on the movement of float portion 64. Alterllativ'ely, float portion 64 may be a solid element comprising a material having a specific gravity less than the specific gravity of ink.

[0047] Indicating portion 62 is configured to indicate whether the amount of ink in the ink chamber 36 is greater thm or equal to a sufficient amount of ink. When pivotable member 60 pivots counterclockwise in Fig. 3(b), indicating portion contacts bottom wall 47 of translucent portion 39, such that further movement of pivotable member 60 is prevented and indicating portion 62 remains at the first position.
When pivotable member 60 pivots clockwise in Fig. 3(b), indicating portion 62 moves away from bottom wall 47 of the translucent portion 39. When float portion 64 contacts a bottom surface of the ink chamber 36, further movement of pivotable member 60 is prevented, and indicating portion 62 remains at the second position apart from bottom wall 47 of translucent portion 39 by a predetermined distance.
(0048] Pivotable member 60 comprises a first portion extending from shaft 66 to indicating portion 62, and a second portion extending from shaft 66 to float portion 64. The mass of the first portion of pivotable member 60 is less than the mass of the second portion of pivotable member 60. Therefore, the second portion of pivotable member 60 is heavier than the first portion of pivotable member 60 in air.
Accordingly, when the ink chamber 36 does not store a sufficient amount of ink therein, e.g_, when the ink chamber 36 is empty of ink, pivotable member 60 pivots clockwise -about shaft- 66 in Fig. 3(b), and indicating portion 62 separates from bottom wall 47 of detecting window 39. When the lower end of float portion 64 contacts the bottom surface of ink chamber 36, pivotable member 60 stops pivoting and the indicating portion 62 remains at the second position. ' When indicator portion 62 is at the second

12 position, it is determined that the amount of ink in ink chamber 36 is less than a sufficient amount of ink.
[0049] In contrast, when the amount of ink in ink chamber 36 is greater than or equal to a sufficient amount of ink, and float portion 64 is submerged in the ink, a buoyancy force acts on float portion 64. The buoyancy force causes the pivotable member 60 to pivot counterclockwise about shaft 66 in Pig. 3(b). When pivotable member 60 pivots counterclockwise, indicating portion 62 contacts bottom wall 47 of translucent portion 39, and pivotable member 60 stops pivoting and indicating portion 62 remains at the first position. When indicating portion 62 is at the first position, it is determined that the amount of ink in ink chamber 36 is greater than or equal to a sufficient amount of ink, [0050] Specifically, whether the amount of ink in ink chamber 36 is greater than or equal to the predetermined amount of ink is determined based on the position of indicating portion 62 in the inner space 46, e.g., the position of indicating portion 62 is detected by a photo interrupter or viewed by a user.
[0051] Front face 40 has an opening 52 formed. therethrough adjacent to an end of front face 40 connected to bottom face 43, and the interior of ink chamber 36 is configured to be in fluid communication with the exterior of case 32 via opening 52.
Ink cartridge 30 comprises an ink supply portion 51 positioned at front face 40 of case 32 adjacent to the end of front face 40 connected to bottom face 43. Ink supply portion 51 comprises a cylindrical rubber member having an inner hole 53 formed therethrough.
The cylindrical rubber member comprises a first portion and. a second portion.
The first portion of the cylindrical rubber member is press fitted in opening 52, and the second. portion of the cylindrical rubber member extends outward from front face 40.
Opening 52 and inner hole 53 are aligned, such that the interior of ink chamber 36 is configured to be in fluid communication with the exterior of case 32 via opening 52 and inner hole 53, A film (not shown) is positioned on an end.of the cylindrical rubber member to cover inner hole 53. When ink cartridge 30 is installed in cartridge accommodating case 101, a connecting portion 111 is connected to ink supply portion 51. such that a needle (not shown) of connecting portion 111 penetrates through the film

13 and enters timer hole 53. Then, ink is supplied from ink chamber 36 to a recording head (hot shown) of multi-function device 10 via=irak supply portion 51 and connecting portion 111.
[0052] An air intake hole 50 is formed through front face 40, and the interior of ink chamber 36 is configured to be in fluid communication with the exterior of case 32 via air intake hole 50. Before ink cartridge 30 is used, a sticker (not shown) covers the air intake hole 50, and the sticker prevents fluid communication between the interior of the ink chamber 36 and the exterior of case 32 via air intake hole 50. When a user intends to use ink cartridge 30, the user removes the sticker, and thereby ink chamber 36 is brought into fluid comnmunication with the exterior of case 32 via air intake hole 50.
[0053] Case 32 comprises a spring seat 48 formed on and extending outwardly from rear face 42 at a middle portion of rear face 42 in the height direction of case 32. An end of coil spring 34 is connected and fixed to spring seat 49.
[0054] Rail 55 extends outwardly from top face 41 and extends from a portion adjacent to front face 40 to a portion adjacent to rear face 42 in the depth direction of case 32. The depth direction of case 32 is indicated by an arrow.69 in Fig.
3(b). Rail 56 extends outwardly from bottom face 43 and extends from a portion adjacent to front face 40 to a portion adjacent to rear face 42 in the depth direction of case 32, (0055] Referring to Figs. 2 and 4, movable member 33 is configured to support case 32, such that ;movable member 33 moves relative to case 32, e.g., slides on case 32 when coil spring 34 expands and contracts. Movable member 33 comprises a first plate portion 90, a second plate portion 91 opposite first plate portion 90, and a third plate portion 92 connected to first plate portion 90 and second plate portion 91.
First plate portion 90 and second plate portion 91 are parallel to each other, and third plate portion 92 is perpendicular to each of first plate portion 90 and second plate portion 91. Each of first plate portion 90 and second plate portion 91 has a f4st end 96 and a second end opposite first end 96, and third plate portion 92 has a first end and a second end opposite the first end. The first end of third plate potion 92 is connected to the second end of first plate portion 90, arid the second end of third plate portion 92 is

14 connected to the second end of the second plate portion 91. Case 32 is surrounded by first plate portion 90, second plate portion 91, and third plate portion 92.
First plate portion 90 faces top face 41, second plate portion 91 faces bottom face 43, and third plate portion 92 faces rear face 42.
[0056] First plate potion 90 has a first groove 88 formed in the surface facing top face 41, and first groove 88 extends from first end 96 of first plate portion 90 towards the second end of first plate portion 90. First plate portion 90 engages top face 41, e.g., first groove 88 extends parallel to rail 55, and rail 55 is positioned within first groove 88. Second plate potion 91 has a second groove 89 formed in the surface facing bottom face 43, and second groove 89 extends from first end 96 of second plate portion 91 towards the second end of second plate portion 91. Second plate portion 91 engages bottom face 43, e.g., second groove 89 extends parallel to rail. 56, and rail 56 is positioned within second groove 89. Each of first groove 88 and second groove 89 has a wide portion 97 adjacent to first end 96, and the width of wide portion 97 increases as wide portion 97 approaches first end 96. During the manufacture of ink cartridge 30, rails 55 and 56 readily slide in first groove 88 and second groove 89 with the aid of wide portions 97, [0057] Third plate portion 92 comprises a spring seat 94 formed on and extending outwardly from the surface facing rear face 42 at a middle portion of third plate portion 92 in the height direction of case 32. An end of coil spring 34 is connected and fixed to spring seat 94.
[0058] Each of first plate portion 90 and second plate portion 91 extends adjacent to and away from front face 40 in the second direction in which translucent portion 39 and ink supply portion 51 extends outwardly from front face 40.
Each of first plate portion 90 and second plate portion 91 extends farther outwardly from front face 40 than translucent portion 39 and ink supply portion 51 extends from front face 40 in the second direction, independent of whether coil spring 34 is in an expanded or contracted position.

10059] In another embodiment, first plate portion 90 or second plate portion 91 may be omitted.

[0060] In an embodiment of the present invention, ink cartridge 30 is manufactured, as follows. An end of coil spring 34 is connected and fixed to spring seat 94 of third plate portion 94, Case 32 is then inserted from rear face 42 side into a space 87 which is surrounded by first plate portion 90, second plate portion 91, and third plate portion 92. Rails 55 and 56 is then inserted into first and second grooves 88 and 89, respectively, via wide portions 97. After that, the other end of coil spring 34 is connected and fixed to spring seat 48 of case 32. The direction in which movable member 33 and case 32 slides relative to each other is parallel to the direction in which coil sprng 34 expands and contracts.
(0061] Referring to pig. 5(a), when ink cartridge 30 is dropped and collides with a surface 23 with third plate portion 92 facing downward, third plate portion 92 contacts the surface 23, and the impact of the collision is at least partially absorbed by coil spring 34. Moreover, referring to rig. 5(b), when the corner of first plate portion 90 and third plate portion 92 contacts surface 23, a component of the impact in the depth direction of case 32 is absorbed by coil spring 34. Consequently, -case, 32 is protected from the impact, and case 32 may not be damaged by the impact.
[00621 Moreover, when ink cartridge 30 is transferred, e.g., during shipment of ink cartridge 30 from a factory, ink cartridge 30 may vibrate.
Nevertheless, the vibration may not be transferred to case 32 because coil spring 34 absorbs the vibration.
Consequently, the vibration may not generate air bubbles, in ink chamber 36, [0063] Referring to rigs. 6(a) and 6(b), when ink cartridge 30 is dropped and collides with surface 23 with from face 40 facing downward, either first end 96 of first plate portion 90 or first end 96 of second plate portion 91, or both, contacts the surface 23, and at least a portion of the impact of the collision is absorbed by coil, spring 34, Consequently, case 32 is protected from the impact, and case 32 may not be damaged by the impact. Moreover, because each of first plate portion 90 and second plate portion 91 extends further outwardly from front face 40 than translucent portion 39 and ink supply portion 51 extends from front face 40, ink supply portion 51 and translucent.portion 39 do not contact surface 23. Consequently, the impact is not directly transferred to ink supply portion 51 or translucent portion 39, or both, which prevents ink supply portion S1 and translucent portion 39 from being damaged.
10064] Referring to Fig_ 7, cartridge accommodating case 101 comprises a case main body 105 and a lock lever 106. Case main body 105 comprises an accommodating chamber 108 formed therein. Case main body 105 has an opening formed =L=herethrottgh, which is positioned adjacent to opening 18 of case 14 of printer portion 12. Ink cartridge 30 is selectively installed in and removed from accommodating chamber 108 via opening 110.

[0065] Case main body 105 has a wall 114 defining an end of accommodating chamber 108 opposite from opening 110, and an optical sensor 103 is provided at wall-114, Optical sensor 103 is a photo interrupter comprising a light emitting portion and a light receiving portion. When ink cartridge 30 is installed in accommodating chamber 108, translucent portion 39 is positioned between the light emitting portion and the light receiving portion, Depending on the position of indicating portion 62 in translucent portion 39, the intensity of light received by the light receiving portion varies. Based on the intensity of light received by the light receiving portion, it is determined whether the amount of ink in ink cartridge 30 is greater than or equal to a sufficient amount of ink.
[0066] A connecting portion 111 is provided at wall 114 below optical sensor 103. Connecting portion 111 extends from wall 144 towards the interior of accommodating chamber 108. When ink cartridge 30 is installed in accommodating chamber 108, connecting portion 111 is connected to ink supply portion 51, such that a needle (not shown) provided at connecting portion 111 penetrates through the fibm (not shown) of ink supply portion 51 and enters inner hole 53. Connecting portion 111 has a through hole 124 formed therethrough, and one end. of through hole 14 is connected to the needle and the other end of through hole 14 is connected to a flexible tube (not shown) which is connected to a recording head (not shown).

[0067] Case main body 105 comprises a bottom wall 117, and a space 113 is formed between bottom wall 117 and connecting portion 111. When ink cartridge is installed in accommodating chamber 108, first end 96 of second plate portion 91 is positioned within space 113.

[0068] The upper end of lock lever 106 is coupled to case main body 105 above opening 110, such that lock lever 106 pivots about the upper end of lock lever 106.
Lock lever 106 is configured to expose accommodating Chamber 108 through opening 110 when lock lever 106 is opened, and to cover opening 110 when lock lever 106 is closed, Lock lever 106 comprises a pressing portion 125 and a claw 126.
Pressing portion 125 extends from a middle portion of an inner surface 129 of lock lever 106.
Claw 126 is positioned at the lower end of look lever 106. Bottom wall 117 has a cut-out 127 formed in the outer surface of bottom wall. 117 below opening 110, and claw 126 is configured to engage cut-out 127.
[0069] Referring to Figs. 8 and 9, the process of installing ink cartridge 30 in cartridge accommodating case 101 is described. Ink cartridge 30 is inserted into accommodating chamber 108 until ink supply portion, 51 contacts connecting portion 111, translucent portion 39 enters between the light emitting portion and the light receiving portion of optical sensor 103, and first end 96 of second plate portion 91 enters space 113.

[0070] Lock lever 106 is then pivoted towards the case main body 105 until pressing portion 125 contacts third plate potion 92. When lock lever 106 pivots further, coil spring 34 contracts and movable member 33 moves towards wall 114, while case 32 remains stationary. When lock lever 106 pivots further, claw 126 engages cut out 127, and lock lever 160 is completely closed and is fixed to case main body 105.
Lock lever 106 retains ink cartridge 30 in case main body 105 and ink supply portion 51 is pressed against connecting portion 111 by coil spring 34.

[0071] With this configuration., ink cat-tage 30 is installed in cartridge accommodating case 101 securely. Moreover, ink cartridge 30 is pressed in an installation direction as indicated by an arrow 70 in Figs. 8 and 9 with a constant force depending on the elasticity of coil spring 34. Furthermore, because ink supply portion 51 is pressed against connecting portion 111 tightly, ink is prevented from leaking between ink supply portion 51 and connecting portion 111.

[0072] When a user intends to remove ink cartridge 30 from cartridge accommodating case 101, the user disengages claw 126 from cut-out 127.

Consequently, coil spring 34 expands, which causes movable member 33 to push up lock lever 106 and causes ink cartridge 30 to be partially ejected from case main body 105. The user then grasps the rear portion of movable member 33 and removes ink cartridge 30 from cartridge accommodating case 101. Thus, ink cartridge 30 is readily removed from cartridge accommodating case 101.
[0073] If the shape of case 32 in the expansion and contraction directions were altered when coil spring 34 expands and contracts, the shape of case 32 might be deformed when ink is consumed from ink chamber 36, and coil spring 34 might be fully expanded when ink stored in the ink chamber 36 is almost used up. In such a case, when the user disengages claw 126 from cut-out 127, coil spring 34 might not expand further, which might not cause movable member 33 to push up lock lever 106 and not cause ink cartridge 30 to be partially ejected from case main body 105.
Nevertheless, in an embodiment, the shape of case 32 in the expansion and contraction directions is not be altered when coil, spring 34 expands and contracts, Therefore, ink cartridge 30 is readily removed from cartridge accommodating case 101.

[0074] In an embodiment, the entire moveable member 33 is configured to substantially simultaneously move in a first direction relative to case 32 when coil spring 34 member expands, and the entire moveable member 33 is configured to substantially simultaneously move relative to case 32 in a second direction opposite the first direction when coil spiting 34 contracts. Therefore, the impact of the collision is sufficiently absorbed by coil spring 34. If the entire moveable member 33 were not configured to substantially simultaneously move relative to case 32, the impact of the collision might not be absorbed by coil spring 34 sufficiently. In particular, if some portion of the movable member 33 were stationary relative to case 32 and attached to case 32, such a portion might be damaged by the impact.
[0075] Referring to Fig. 10, an ink cartridge 140 according to another embodiment of the present invention is depicted. In this embodiment, movable member 33 comprises a first plate portion 142 and a second plate portion 143 instead of first plate pardon 90 and second plate portion 91. A cross-sectional shape of each of first plate portion 142 and second plate portion 143 is trapezoidal. The upper base of = i i the trapezoidal cross seetional.shape of first plate portion 142 is shorter than the lower base of the trapezoidal cross-sectional shape of first plate portion 142. The upper base of the trapezoidal cross-sectional shape of second plate portion 143 is longer than the lower base of the trapezoidal cross-sectional shape of second plate portion 143. Case 32 does not convprise rails 55 and 56, but comprises a groove 144 and a groove formed in top face 41 and bottom face 43, respectively. Groove 144 extends from the coiner of top face 41 and front face 40 to the comer of top face 41 and rear face 42 in the depth direction of case 32, and groove 145 extends from the corner of bottom face 43 and front face 40 to the corner of bottom face 43 and rear face 42 in the depth direction of case 32. A cross-sectional. shape of each of groove 144 and groove 145 is trapezoidal. The upper base of the trapezoidal cross-sectional shape of groove 144 is shorter than the lower base of the trapezoidal cross-sectional shape of groove 144. The upper base of the trapezoidal-cross sectional shape of groove 145 is longer than the lower base of the trapezoidal-cross sectional shape of groove 145. First plate portion 142 and second plate portion 143 are inserted into groove 144 and groove 145, respectively, such that first plate portion 142 and second plate portion 143 slides in groove 144 and groove 145, respectively. Because of the trapezoidal cross-sectional shape of first plate portion 142, second plate portion 143, groove 144, and groove 145, case 32 and movable member 30 are coupled securely, and Zak cartridge 140 may be disassembled only when movable member 3 0 slides off case 32 in the depth direction of case 32.
[0076] Referring to Figs. 11(a) and 11(b), an ink cartridge 150 according to yet another embodiment of the present invention is depicted. In this embodiment, movable member 33 father comprises a fourth plate portion 152 extending from first end 96 of first plate portion 90 downwardly awl substantially perpendicular to first plate portion 90, The lower end of fourth plate portion 152 is positioned above and adjacent to translucent portion 39. Fourth plate portion 152 may be manufactured separately from movable member 33, and may be attached to movable member 33 via ultrasonic welding, [0077) When ink cartridge 150 contacts a surface with front face 40 facing downward, front face 40 is protected by fourth plate portion 152. For example, when ink cartridge 150 contacts a surface with an amount of force greater than a predetermined amount of force, and coil spring 32 expands too much, the sliding motion of case 32 to the front face 40 side is restricted by forth plate portion 152.
[0078] Referring to Figs. 12(a)-15, an ink cartridge 160 according to still another embodiment of the present invention is depicted, In this embodiment, movable member 33 further comprises a grasping portion 162 formed on and extending from the outer surface of third plate portion 92, Ink cartridge 160 is configured to be installed in a cartridge accommodating case 165. When a user intends to install. or remove ink cartridge 160 in or from cartridge accommodating case 165, the user grasps grasping portion 162.

[0079] The position of grasping portion 162 depends on the color of ink stored in ink cartridge 160. Referring to Fig. 13, a grasping portion 162K of an ink cartridge 160K storing black ink is positioned adjacent to the upper end of third plate portion 92, a grasping portion 162C of- an ink cartridge 160C storing cyan ink is - "
positioned below grasping portion 162K of ink cartridge 160K, a grasping portion 162Y
of an ink cartridge 160Y storing yellow ink is positioned below grasping portion 162C
of ink cartridge 160C, and a grasping portion 162M of an ink cartridge 160M
storing magenta ink is positioned adjacent to the lower end of thud plate portion 92 and below grasping portion 162Y of ink cartridge 160Y. When ink cartridges 160K, 160C.
160Y, and 162M are placed side by side, grasping portions 162K, 162C, 162Y, and 162M
are offset in the height direction of case 32. Therefore, a user readily grasps grasping portions 162K, 162C, 162Y, and 162M without interference from adjacent grasping portions 162K,162C,162Y, and 162M.

[0080) Referring to Figs. 14 and 15, lock lever 106 comprises a recess 167 formed ill inner surface 129 of lock lever 106 instead of pressing portion 125. When ink cartridge 160 is=installed in cartridge accommodating case 165, grasping portion 162 is accommodated in recess 167. The shape and the position of recess 167 corresponds to the shape and the position of grasping portion 162. The position of recess depends on the color of ink which is stored in the installed ink cartridge 160, i i [0081] Referring to Figs. 14 and 15, the process of installing ink cartridge 160 in cartridge accommodating case 165 is described. Ink cartridge 160 is inserted into accommodating chamber 108 until ink supply portion 51 contacts connecting portion 111. Lock lever 106 is then pivoted towards the case mama body 105, grasping portion 162 enters recess 167, and an end 163 of grasping portion 162 contacts a bottom 168 of recess 167. When lock lever 106 pivots further, coil spring 34 contracts and movable member 33 moves towards wall 114, and case 32 remains stationary. When lock lever 160 pivots further, claw 126 engages cutout 127, and lock lever 160 is completely closed and fixed to case main body 105.
[0082] Because the position of recess 167 depends on the color of ink which the installed ink cartridge 160 stores therein, if ink cartridge 160K is inadvertently installed in cartridge accommodating case 165 configwed to accommodate ink cartridge 160C, recess 167 does not accommodate grasping portion 162K. Consequently, a user readily notices that the user installed the ink cartridge in a wrong one of cartridge accommodating cases 165.
[0083] While the invention has been described in connection with exemplary embodiments, it will be understood by those skilled in the art that ocher variations and modifications of the exemplary embodiments described above may be made without departing from the scope of the invention. Other embodiments will be apparent to those skilled in the = art from a consideration of the specification or practice of the invention disclosed herein.. It is intended that the specification and the described examples are considered merely as exemplary of the invention, with the true scope of the invention being indicated by the flowing claims.
Industrial Applicability [0084] The ink cartridge of the present invention is widely used for home and office uses.

Claims

What is claimed is:

1. An ink cartridge, comprising:
a case having at least a portion of an ink chamber defined therein, wherein the ink chamber is configured to store ink, and the case has a front face and a rear face opposite the front face;
an ink supply portion positioned at the front face of the case, wherein the ink supply portion is configured to dispense ink from an interior of the ink chamber to an exterior of the ink chamber;
a movable member configured to move relative to the case; and at least one resilient member having a first end which is coupled to the rear face of the case and a second end which is coupled to the movable member, wherein the at least one resilient member is configured to expand in an expansion direction and to contract in a contraction direction opposite the expansion direction to move the movable member relative to the case, and a shape of the case in the expansion and contraction directions is unaltered when the at least one resilient member expands and contracts, wherein the entire moveable member is configured to substantially simultaneously move in a first direction relative to the case when the at least one resilient member expands, and the entire moveable member is configured to substantially simultaneously move in a second direction opposite the first direction when the at least one resilient member contracts, wherein the case further comprises a particular face connected to each of the front face and the rear face, and the movable member comprises a first portion and a second portion extending from the first portion in the second direction, wherein the at least one resilient member is coupled to the first portion of the movable member, and the second portion of the movable member engages the particular face and is configured to slide on the particular face.

2. The ink cartridge of claim 1, further comprising an air intake portion positioned at the case, wherein the air intake portion is configured to draw air into the ink chamber.

3. The ink cartridge of claim 2, wherein the air intake portion is positioned at the front face of the case.

4. The ink cartridge of claim 1, wherein at least one portion of the movable member extends adjacent to and away from the front face of the case in the second direction.

5. The ink cartridge of claim 4, wherein the ink supply portion extends from the front face of the case in the second direction, and the at least one portion of the movable member extends further from the front face of the case in the second direction than the ink supply portion extends from the front face of the case in the second direction.

6. The ink cartridge of claim 1, further comprising:
a translucent portion positioned at the front face of the case and extending away from the ink chamber, wherein the translucent portion has an inner space formed therein, and the inner space is configured to be in fluid communication with the ink chamber;
a further movable member positioned within the inner space, wherein the further movable member is configured to move within the inner space based on an amount of ink in the ink chamber.

7. The ink cartridge of claim 6, wherein at least one portion of the movable member extends adjacent to and away from the front face of the case in the second direction.

8. The ink cartridge of claim 7, wherein each of the ink supply portion and the translucent portion extends from the front face of the case in the second direction, and the at least one portion of the movable member extends further from the front face of the case in the second direction than each of the ink supply portion and the translucent portion extends from the front face of the case in the second direction.

9. The ink cartridge of claim 1, wherein the second portion of the movable member extends away from the front face in the second direction.

10. The ink cartridge of claim 9, wherein the ink supply portion extends from the front face of the case in the second direction, and the second portion of the movable member extends further from the front face of the case in the second direction than the ink supply portion extends from the front face of the case in the second direction.

11. The ink cartridge of claim 10, further comprising:
a translucent portion positioned at the front face of the case and extending away from the ink chamber, wherein the translucent portion has an inner space formed therein, and the inner space is configured to be in fluid communication with the ink chamber;
a further movable member positioned within the inner space, wherein the further movable member is configured to move within the inner space based on an amount of ink in the ink chamber, wherein each of the ink supply portion and the translucent portion extends from the front face of the case in the second direction, and the second portion of the movable member extends further from the front face of the case in the second direction than each of the ink supply portion and the translucent portion extends from the front face of the case in the second direction.

12. The ink cartridge of claim 1, wherein the case further comprises a further face opposite the particular face and connected to each of the front face and the rear face, wherein the movable member further comprises a third portion extending from the first portion in the second direction, and the third portion of the movable member engages the further face and extends away from the front face in the second direction.

13. The ink cartridge of claim 12, wherein the ink supply portion extends from the front face of the case in the second direction, and each of the second portion and the third portion of the movable member extends further from the front face of the case in the second direction than the ink supply portion extends from the front face of the case in the second direction.

14. The ink cartridge of claim 13, further comprising:
a translucent portion positioned at the front face of the case and extending away from the ink chamber, wherein the translucent portion has an inner space formed therein, and the inner space is configured to be in fluid communication with the ink chamber;
a further movable member positioned within the inner space, wherein the further movable member is configured to move within the inner space based on an amount of ink in the ink chamber, wherein each of the ink supply portion and the translucent portion extends from the front face of the case in the second direction, and each of the second portion and the third portion of the movable member extends further from the front face of the case in the second direction than each of the ink supply portion and the translucent portion extends from the front face of the case in the second direction.

15. The ink cartridge of claim 1, wherein the movable member is positioned outside the ink chamber.

16. The ink cartridge of claim 1, wherein the ink chamber is positioned between the front face and the rear face of the case.