Patent Publication Number: US-9840081-B2

Title: Liquid supply device and ink-jet printer

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This is a continuation application of U.S. patent application Ser. No. 14/598,351, filed on Jan. 16, 2015. This application claims priority to Japanese Patent Application No. 2014-007516 filed on Jan. 20, 2014. The entire disclosures of U.S. patent application Ser. No. 14/598,351 and Japanese Patent Application No. 2014-007516 are hereby incorporated herein by reference. 
    
    
     BACKGROUND 
     Technical Field 
     The present invention relates to a liquid supply device and an ink-jet printer. 
     Related Art 
     Conventionally, as an example of a liquid ejection device, an ink-jet printer is known. In the ink jet printer, it is possible to perform printing on a print medium by ejecting ink as an example of liquid from an ejection head to the print medium such as print paper. Some liquid ejection devices are known to provide a liquid supply device in which ink stored in a tank (ink storage section) as an example of a liquid storing container is supplied to an ejection head (print head) via a tube (hose). As the liquid supply device, conventionally, a structure in which ink stored in a tank (ink storage section) is supplied to an ejection head (print head) via a tube (hose) is known (see Japanese Unexamined Patent Application Publication No. 2012-71581, for example). Also, for the liquid device with the liquid ejection device, when supplying ink to a tank, it is known that a posture (hereinafter a using posture) of the tank when using the liquid ejection device is inclined to a posture (hereinafter an injecting posture) of the tank for injecting the ink to the tank (for example, see Japanese Unexamined Patent Application Publication No. 2012-51307). Hereinafter, a structure in which the liquid ejection device is equipped with the liquid supply device may sometimes be denoted as a liquid ejection system. 
     SUMMARY 
     A liquid supply device according to one aspect is adapted to supply liquid to a liquid ejection section configured and arranged eject the liquid. The liquid storing device includes a plurality of liquid storage sections and a plurality of tubes. The liquid storage sections are configured and arranged to store the liquid. The tubes are connected to the liquid storage sections so that the liquid stored in the liquid storage sections flows out through the tubes. At least one of the tubes is respectively connected to a corresponding one of the liquid storage sections. At least one of the liquid storage sections includes a support section supporting at least two of the tubes in a state in which the at least two of the tubes are aligned in a direction perpendicular to one surface of the at least one of the liquid storage sections. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Referring now to the attached drawings which form a part of this original disclosure: 
         FIG. 1  is a perspective view showing a liquid ejection system of the present embodiment. 
         FIG. 2  is a perspective view showing the liquid ejection system of the present embodiment. 
         FIG. 3  is a perspective view showing the liquid ejection system of the present embodiment. 
         FIG. 4  is a perspective view showing a mechanism unit and an ink supply device of the present embodiment. 
         FIG. 5  is a perspective view showing a print section of the present embodiment. 
         FIG. 6  is a perspective view showing the liquid ejection system of the present embodiment. 
         FIG. 7  is an exploded perspective view showing the ink supply device of Example 1. 
         FIG. 8  is a perspective view showing a tank of the present embodiment. 
         FIG. 9  is a perspective view showing the tank of the present embodiment. 
         FIG. 10  is a perspective view showing a plurality of tanks of the present embodiment. 
         FIG. 11  is a perspective view showing a tank unit and a support frame of Example 1. 
         FIG. 12  is a perspective view showing the tank unit, a supply tube, and the support frame of Example 1. 
         FIG. 13  is a perspective view showing the tank unit of Example 1. 
         FIG. 14  is a perspective view showing a tank and a support member of Example 1. 
         FIG. 15  is an exploded perspective view showing the tank and the support member of Example 1. 
         FIG. 16  is a side view showing the tank and the support member of Example 1. 
         FIG. 17  is a perspective view showing the tank unit of Example 1. 
         FIG. 18  is a perspective view showing the tank unit and a flow passage opening/closing device of Example 1. 
         FIG. 19  is an exploded perspective view showing the flow passage opening/closing device of the example 1. 
         FIG. 20  is an exploded perspective view showing the flow passage opening/closing device of Example 1. 
         FIG. 21  is an exploded perspective view showing a tube support section and a pressing member of Example 1. 
         FIG. 22  is an exploded perspective view showing the flow passage opening/closing device of Example 1. 
         FIG. 23  is an exploded perspective view showing the flow passage opening/closing device of Example 1. 
         FIG. 24  is a cross-sectional view of A-A line in  FIG. 23 . 
         FIG. 25  is a cross-sectional view showing a state in which a first cam and a second cam of Example 1 come down. 
         FIG. 26  is a cross-sectional view of B-B line in  FIG. 23 . 
         FIG. 27  is a cross-sectional view showing a state in which the first cam and the second cam of Example 1 come down. 
         FIG. 28  is a perspective view showing the flow passage opening/closing device of Example 1. 
         FIG. 29  is an exploded perspective view showing an ink supply device of Example 2. 
         FIG. 30  is a perspective view showing a tank unit of Example 2. 
         FIG. 31  is a perspective view showing the tank and a support member of Example 2. 
         FIG. 32  is an exploded perspective view showing the tank and the support member of Example 2. 
         FIG. 33  is a perspective view showing the support member of Example 2. 
         FIG. 34  is a cross-sectional view of C-C line in  FIG. 33 . 
         FIG. 35  is a perspective view showing the support member, a supply tube, and an extension tube of Example 2. 
         FIG. 36  is a side view showing the tank and the support member of Example 2. 
         FIG. 37  is a perspective view showing the tank unit of Example 2. 
         FIG. 38  is a perspective view showing the tank unit and a flow passage opening/closing device of Example 2. 
         FIG. 39  is an exploded perspective view showing the flow passage opening/closing device of Example 2. 
         FIG. 40  is an exploded perspective view showing the flow passage opening/closing device of Example 2. 
         FIG. 41  is an exploded perspective view showing a tube support section and a pressing member of Example 2. 
         FIG. 42  is an exploded perspective view showing the flow passage opening/closing device of Example 2. 
         FIG. 43  is an exploded perspective view showing the flow passage opening/closing device of Example 2. 
         FIG. 44  is a cross-sectional view of D-D line in  FIG. 43 . 
         FIG. 45  is a perspective view showing a cross-section of an XZ plane formed by a first cam and a second cam of Example 2. 
         FIG. 46  is a cross-sectional view showing a state in which the first cam and the second cam of Example 2 come down. 
         FIG. 47  is a perspective view showing the flow passage opening/closing device of Example 2. 
         FIG. 48  is an exploded perspective view showing a flow passage opening/closing device of Example 3. 
         FIG. 49  is a perspective view showing a tube support section and a pressing member of Example 3. 
         FIG. 50  is a perspective view showing the tube support section and the pressing member of Example 3. 
         FIG. 51  is a perspective view showing an ink supply device to which the flow passage opening/closing device of Example 3 can be applied. 
         FIG. 52  is a perspective view showing the ink supply device to which the flow passage opening/closing device of Example 3 can be applied. 
         FIG. 53  is a perspective view showing the ink supply device to which the flow passage opening/closing device of Example 3 can be applied. 
         FIG. 54  is a front surface view showing the ink supply device to which the flow passage opening/closing device of Example 3 can be applied. 
         FIG. 55  is a perspective view showing the ink supply device of the present embodiment. 
         FIG. 56  is a perspective view showing a tank of Example 4-1. 
         FIG. 57  is an enlarged view of a part F in  FIG. 56 . 
         FIG. 58  is a cross-sectional view on G-G line in  FIG. 57 . 
         FIG. 59  is a perspective view showing a tank of Example 4-2. 
         FIG. 60  is an enlarged view of a part H in  FIG. 59 . 
         FIG. 61  is a cross-sectional view of M-M line in  FIG. 59 . 
         FIG. 62  is a perspective view showing a tank of Example 4-3. 
         FIG. 63  is an enlarged view of a part N in  FIG. 62 . 
         FIG. 64  is a cross-sectional view of Q-Q line in  FIG. 63 . 
         FIG. 65  is a perspective view showing a tank of Example 4-4. 
         FIG. 66  is an enlarged view of a part S in  FIG. 65 . 
         FIG. 67  is a cross-sectional view of T-T line in  FIG. 66 . 
         FIG. 68  is a perspective view showing a tank of Example 4-5. 
         FIG. 69  is an enlarged view of a part V in  FIG. 68 . 
         FIG. 70  is a cross-sectional view of W-W line in  FIG. 69 . 
         FIG. 71  is a perspective view showing a cap member of the present embodiment. 
         FIG. 72  is a perspective view showing a tank and the cap member of the present embodiment. 
         FIG. 73  is a perspective view showing a tank and a cap member of Example 4-4. 
     
    
    
     DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS 
     Embodiments of the liquid ejection system, as an example, with the ink-jet printer (hereinafter printer), as an example of the liquid ejection device, will be described with reference to the drawings. In each of the drawings, the scale of the arrangements and parts may be different because each of the figures is shown to be large enough to recognize each of the arrangements. 
     First Embodiment 
     The liquid ejection system  1  of the first embodiment is, as shown in  FIG. 1 , provided with a printer  3 , as an example of the liquid ejection device, and an ink supply device  5  as an example of the liquid supply device. The printer  3  includes a printer case  6 . The printer case  6  constitutes an outer shell of the printer  3 . The ink supply device  5  includes a tank case  7  and a plurality of (at least two) tanks  9 . The printer case  6  and the tank case  7  constitute an outer shell of the liquid ejection system  1 . The tank  9  is an example of a liquid storing container. 
       FIG. 1  includes XYZ axes as a coordinate system in which they intersect perpendicular to each other. Hereinafter, the XYZ axes are shown in figures, if necessary. A direction of an arrow shows a +direction (positive direction) for each of the XYZ axes, and the other direction shows a −direction (negative direction). When the liquid ejection system  1  is in use, the liquid ejection system  1  is provided on a horizontal plane made by the X and Y axes. When the liquid ejection system  1  is in use, the Z axis is an axis intersecting perpendicularly to the horizontal plane, where a −Z direction is a vertically-down direction. 
     The printer case  6  includes a paper feed cover  11  and a paper ejection cover  12 . The paper feed cover  11 , as shown in  FIG. 2 , is arranged rotatable in an R 1  direction in the figure with respect to the printer case  6 . With this, the paper feed cover  11  is arranged openable/closable with respect to the printer case  6 . When the paper feed cover  11  is in a state of being open with respect to the printer case  6  (hereinafter referred to as “open state”), it becomes a state in which a print medium P such as print paper is fed to the printer  3  from the paper feeding section  13 . Also, the paper ejection cover  12  is arranged rotatable in an R 2  direction in the figure with respect to the printer case  6 . With this, the paper ejection cover  12  is arranged openable/closable with respect to the printer case  6 . When the paper ejection cover  12  is in a state of being open with respect to the printer case  6 , it becomes a state in which the print medium P is discharged from the paper discharge section  14  to the outside of the printer  3 . In  FIG. 2 , the open states of the paper feed cover  11  and the paper ejection cover  12  are shown. On the other hand, in  FIG. 1 , close states of paper feed cover  11  and the paper ejection cover  12  are shown. 
     A mechanism unit  15  ( FIG. 4 ) of the printer  3  is stored in the printer case  6 . The mechanism unit  15  is a mechanism part which performs printing at the printer  3 . The details of the mechanism unit  15  will be described hereinafter. The plurality of tanks  9  are stored in the tank case  7  as shown in  FIG. 1 , and each of them stores the ink for printing. In the liquid ejection system  1 , the plurality of tanks  9  are provided outside the printer case  6 . For this reason, in the liquid ejection system  1 , the plurality of tanks  9  are not stored in the printer case  6  which covers the mechanism unit  15 . 
     For the printer  3 , a surface on which the paper discharge section  14  ( FIG. 2 ) is provided is a front surface  16 . Also, the printer  3  includes a control panel  18  on an upper surface  17  which intersects with a front surface  16 . On the control panel  18 , a power button  19 A, other control button  19 B, and the like are provided. In the printer case  6 , the ink supply device  5  is provided on a side part  21  which intersects the front surface  16  and the upper surface  17 . A window part  22  is provided on the tank case  7 . On the tank case  7 , the window part  22  is provided on a side part  27  which intersects with the front surface  23  and the upper surface  25 . The window part  22  includes a light permeability. The plurality of tanks  9  are provided at a place to overlap with the window part  22 . For this reason, an operator who uses the liquid ejection system  1  can see the plurality of tanks  9  via the window part  22 . The surface overlapping the window part  22  at each of the tanks  9  is set to be a visible surface  28  through which the ink in the tank  9  is visible. The remaining amount of the ink in the tank  9  can be seen through the visible surface  28 . 
     In the present embodiment, a part of each of the tanks  9  facing the window part  22  possesses light permeability. From the part of each of the tanks  9  having the light permeability, the ink in the tank  9  can be seen. Therefore, an operator can see the plurality of tanks  9  via the window part  22 , and therefore can see the ink amount of each of the tanks  9 . The printer case  6  and the tank case  7  are provided mutually independent to each other. And in the present embodiment, as shown in  FIG. 3 , the tank case  7  is detachable from and attachable to the printer case  6  with the plurality of tanks  9  accommodated therein. 
     The mechanism unit  15  of the printer  3 , as shown in  FIG. 4  which is a perspective view showing the mechanism unit  15  and the supply device  5 , includes a print section  41 . Also, the ink supply device  5  includes a supply tube  43 . The print section  41 , as shown in  FIG. 5 , includes a carriage  45 , a print head  47  as an example of the liquid ejection section, and a plurality of relay units  49 . The print head  47  and the plurality of relay units  49  are provided on the carriage  45 . The supply tube  43  has elasticity and is provided between the tank  9  ( FIG. 4 ) and the relay unit  49 . The ink in the tank  9  is transferred to the relay unit  49  ( FIG. 5 ) via the supply tube  43 . The relay unit  49  relays the ink, which has been supplied from the tank  9  via the supply tube  43 , to the print head  47 . The print head  47  jets the ink having been supplied as ink droplets. 
     Further, the liquid ejection system  1  includes a control section (not shown in figures), a medium conveyance mechanism (not shown in figures), and head conveyance mechanism (not shown in figures). The control section controls movement of the liquid ejection system  1 . The movement of the liquid ejection system  1  is controlled by the control section. On the basis of instructions from the control section, the medium conveyance mechanism transfers the print medium P in the Y axis direction by driving the medium conveyance mechanism by the drive from the motor (not shown in figures). On the basis of instructions from the control section, the head conveyance mechanism transfers the carriage  45  along the X axis by transmitting the drive from the motor (not shown in figures) via a timing belt (not shown in figures). The print head  47  is provided on the carriage  45 . For this reason, the print head  47  can be transferred along the X axis via the carriage  45 . The print head  47  is supported by the carriage  45  in a state of facing the print medium P. By the medium conveyance mechanism and the head conveyance mechanism, by changing the relative position of the print head  47  with respect to the print medium P, printing is performed on the print medium by ejecting the ink from the print head  47 . 
     In the liquid ejection system  1 , an ink inlet section (described later) is provided in each of the tanks  9 . The operator or a user can inject the ink in the tank  9  from the ink inlet section. For example, when the ink in the tank  9  is consumed by printing, and the ink amount in the tank  9  is decreased, the user or the operator can refill the ink in the tank  9  from the ink inlet section. The ink inlet section is stored inside the tank case  7 , and is covered by the tank case  7  and the printer case  6 . For this reason, in a state (state which is shown in  FIG. 1 ) in which the tank case  7  and the printer case  6  are equipped, the user or the operator cannot see the ink inlet section. 
     By removing the tank case  7  from the printer case  6 , and overturning the tank case  7  to the side with respect to the printer case  6  and being in an open state by rotating an upper panel  62 , the ink inlet section  57 , as shown in  FIG. 6 , is exposed from the tank case  7 . The upper panel  62  constitutes the upper surface  25  when the tank case  7  is in the posture shown in  FIG. 1 . The ink inlet section  57  is provided with a cap  58 . The ink inlet section  57  is closed with the cap  58 . The user or the operator injects the ink in the tank  9  after removing the cap  58  from the ink inlet section  57 , when the injecting the ink in the tank  9 . 
     When overturning the tank case  7  to the side as shown in  FIG. 6 , the window part  22  ( FIG. 1 ) of the tank case  7  is oriented in the −Z axis direction. When the window part  22  of the tank case  7  is in a state of being oriented in the −Z axis direction, the visible surface  28  ( FIG. 1 ) of the tank  9  is also oriented in the −Z axis direction. The posture of the visible surface  28  of the tank  9  being oriented in the −Z axis direction is denoted as an injecting posture. In the present embodiment, with the injecting posture, the ink inlet section  57  is oriented to the +Z axis direction, as shown in  FIG. 6 . On the other hand, a posture with which the visible surface  28  of the tank  9  is oriented in a direction intersecting with the Z axis (for example, the X axis or the Y axis shown in  FIG. 1 ) is denoted as a using posture. In the present embodiment, with the using posture shown in  FIG. 1 , the ink inlet section  57  is oriented in the −X axis direction. 
     EXAMPLE 1 
     An ink supply device  5 A of Example 1 will be described. The ink supply device  5 A of Example 1, as shown in  FIG. 7 , includes the tank case  7 , a plurality of supply tubes  43 , a tank unit  71 , a support frame  73 , and a flow passage opening/closing device  75 . The tank unit  71  includes the plurality of tanks  9  being mutually connected. In the ink supply device  5 A of Example 1, the tank unit  71  includes six of the tanks  9 . 
     For the tank unit  71  shown in  FIG. 7 , a kind of the ink is different for each of the tanks  9 . For the ink supply device  5 A, the kinds of the inks include six kinds being black, yellow, magenta, cyan, light magenta, and light cyan. And the tank  9  storing the black ink, the tank  9  storing the yellow ink, the tank  9  storing the magenta ink, the tank  9  storing the cyan ink, the tank  9  storing the light magenta ink, and the tank  9  storing the light cyan ink are provided. 
     The supply tube  43  is provided for each of the tank  9 . For this reason, in the ink supply device  5 A, there are six of the supply tubes  43  being provided. The tank unit  71  is supported by the support frame  73 . On the tank unit  71 , each of the tanks  9  is secured on the support frame  73  by screws. Also, the tank case  7  is also secured on the support frame  73  by screws. And the tank unit  71  is stored in an area surrounded by the support frame  73  and the tank case  7 . 
     Here, the tank  9  will be described. The tank  9 , as shown in  FIG. 8 , includes a storage  81  and a sheet member  83 . In the storage  81 , a recessed section (not shown in figures) is arranged. The sheet member  83  is connected to the storage  81 , and closes the recess section of the storage  81 . At least a part of a space surrounded by the storage  81  and the sheet member  83  functions as the ink storage section. The ink is stored in the ink storage section. In the storage  81 , the ink inlet section  57  which is mentioned before, a vent  84 , a vent portion  85 , and a supply port  86  are provided. The ink inlet section  57  communicates to the ink storage section in the tank  9 . 
     Also, each of the vent  84  and the supply port  86  communicates to the ink storage section. The vent  84  is provided on the side wall  87  of the storage  81 . The vent  84  is provided at the vent portion  85 . The vent portion  85  protrudes in the −X axis direction from the side wall  87  of the storage  81 . The vent portion  85  is cylindrically formed. The vent  84  is an opening arranged at the vent portion  85 , and is a flow opening (or introduction opening) of the air to the ink storage section. When the ink in the ink storage section is consumed and the ink amount in the ink storage section is decreased, the pressure in the ink storage section becomes lower than the air pressure outside. At this time, the air can be introduced from the vent  84  in the ink storage section, and the pressure in the ink storage section can be easily maintained equal to the air pressure outside. The supply port  86  is positioned closer to the −Z axis direction side than the bottom surface  89  of the tank  9 . The supply port  86  is a discharge outlet at which the ink in the ink storage section can be discharged outside the ink storage section. The ink in the ink storage section is supplied to the print head  47  ( FIG. 5 ) via the supply port  86 . The supply tube  43  which is shown in  FIG. 7  is connected to the supply port  86 . 
     Between the side wall  87  and the bottom surface  89 , a side wall  88  is provided. The side wall  88  intersects with the bottom surface  89  and extends from the bottom surface  89  in the Z axis direction. The side wall  88  is positioned closer to the −X axis direction side than the side wall  87 . For this reason, between the side wall  87  and the side wall  88 , a gap in the X axis direction is arranged. For the six of the tanks  9  of the tank unit  71 , the flow passage opening/closing device  75  ( FIG. 7 ) is provided at a part of a space of the gap between the side wall  87  and the wall  88 . 
     On the bottom surface  89  of the storage  81 , a side wall  91  which protrudes in the −Z direction from the bottom surface  89  is provided. On the side wall  91 , an opening  93  which penetrates through the side wall  91  is provided. The side wall  91  on which the opening  93  is provided has a frame shape. The opening  93  is formed in a size capable of inserting the supply tube  43 . The side wall  91  having the frame shape is arranged to be supportable in supporting the supply tube  43  being inserted in the opening  93 . Also, the storage  81 , as shown in  FIG. 9 , includes a fitting section  97  which protrudes in the Y axis direction from the side wall  95 , and a fitted section  99  provided opposite (−Y axis direction side) to the fitting section  97 . Two of the tanks  9  which are next to each other along the Y axis, as shown in  FIG. 10 , are connectable by coupling one of the fitting section  97  of the tank  9  and the other of the fitted section  99  ( FIG. 9 ) of the tank  9  to each other. In this way, it is possible to connect the plurality of the tanks  9  by the fitting section  97  and the fitted section  99 . 
     At the tank unit  71 , as shown in  FIG. 11 , in a state in which the six of the tanks  9  are connected, each of the tanks  9  is secured to the support frame  73 . By the way, in  FIG. 11 , a state in which a part of support frame  73  is cut is depicted in order to show the arrangement for better understanding. A space is arranged between the bottom surface  89  of the tank  9  and the bottom surface  101  of the support frame  73 . In other words, the space  103  is arranged between the bottom surface  89  of the tank  9  and the bottom surface  101  of the support frame  73 . The supply tube  43  connected to the supply port  86  of the tank  9 , as shown in  FIG. 12 , is piped in the space  103 . At least a part of the plurality of the supply tube  43  are arranged in a state of being inserted (a state of penetrating) to the opening  93  of the side wall  91  having the frame shape. With this, it is possible to keep the chance low of the plurality of the supply tubes  43  being spread in the space  103 . In other words, it is easy to bundle the plurality of the supply tubes  43 . 
     A support member  105  is provided on the tank unit  71 , as shown in  FIG. 13 . The support member  105  supports in the Z axis direction three of the supply tubes  43  out of the six of the supply tubes  43 . The support member  105  is provided at the tank  9 A 3  which is third in the −Y axis direction from the tank  9 A 1  being located closest to the Y axis side on the tank unit  71 . The support member  105  supports the supply tube  43 A 6  connected to the tank  9 A 6 , the supply tube  43 A 5  connected to the tank  9 A 5  being next to the tank  9 A 6 , and the supply tube  43 A 4  connected to the tank  9 A 4  being next to the tank  9 A 5 . 
     The supply tube  43 A 6  connected to the tank  9 A 6  reaches the support member  105 , passing through the opening  93 A 6  of the tank  9 A 6 , the opening  93 A 5  of the tank  9 A 5 , and the opening  93 A 6  of the tank  9 A 4 . The supply tube  43 A 5  reaches the support member  105 , passing through the opening  93 A 5  of the tank  9 A 5 , and the opening  93 A 4  of the tank  9 A 4 . The supply tube  43 A 4  reaches the support member  105 , passing through the opening  93 A 4  of the tank  9 A 4 . One support member  105  is provided for the tank unit  71 , but the number of the support member  105  is not limited to one. For the tank unit  71 , an arrangement in which, for example, a plurality of support members  105  are provided can be employed. 
     The support member  105  is provided on the side wall  91  of the tank  9 , as shown in  FIG. 14 . The support member  105 , as shown in  FIG. 15 , is arranged detachable from/attachable to the tank  9 . The support member  105  includes a pair of fitting section  107 , and an engagement section  109 . Also, an opening  111  and a notch  113  are provided on the support member  105 . The pair of the fitting sections  107  protrudes in the Z axis direction from the frame  115  having the frame shape due to the opening  111 . In the Y axis direction, between the pair of the fitting sections  107 , a space is arranged. The engagement section  109  protrudes in the Z axis direction from the frame  115 . The opening  111  is arranged on the frame  115 , and penetrates through the frame  115  in the Y axis direction. The notch  113  is provided on the side of Z axis direction of the frame  115 . The notch  113  opens in the Z axis direction. 
     The support member  105  having the above mentioned arrangement is equipped on the side wall  91  of the tank  9 . At this time, the pair of the fitting section  107  couples with the side wall  91 , and the engagement section  109  engages with the opening  93 . With this, as shown in  FIG. 14 , the support member  105  is equipped on the tank  9 . In a state in which the support member  105  is equipped on the tank  9 , the support member  105  and the side wall  91  constitute the support section  117 . When the engagement of the engagement section  109  is released in a state in which the support member  105  is equipped on the tank  9 , and the support member  105  is displaced in the −Z axis direction with respect to the tank  9 , the support member  105  can be removed from the tank  9 . 
     In the state in which the support member  105  is equipped on the tank  9 , the notch  113  overlaps with the opening  93  of the tank  9 . Further, as shown in  FIG. 16 , the opening  93  and the notch  113  constitute the opening  119 . In  FIG. 16 , in order to understand the arrangement better, an area of the opening  119  is hatched. The opening  119  is formed in a size, such that the supply tube  43  can be inserted. The supply tube  43  which is inserted in the opening  119  is supported in the Z axis direction by the opening  119 . Also, a change amount in the X and −X axis direction of the supply tube  43  which is inserted in the opening  119  is limited by the opening  93  and the support member  105 . 
     In the opening  119 , as shown in  FIG. 17 , the supply tube  43 A 3  connected to the tank  9 A 3  is inserted. With this, the supply tube  43 A 6 , the supply tube  43 A 5 , the supply tube  43 A 4 , and the supply tube  43 A 3  of the plurality of supply tubes  43  are supported by the support section  117 . The support section  117  supports the supply tube  43 A 6 , the supply tube  43 A 5 , the supply tube  43 A 4 , and the supply tube  43 A 3  on the bottom surface  89 . The supply tube  43 A 3  is shifted further to the Z axis direction by the support section  117  than the supply tube  43 A 6 , the supply tube  43 A 5 , and the supply tube  43 A 4 . In other words, the support section  117  aligns and supports the supply tube  43 A 6 , the supply tube  43 A 5 , the supply tube  43 A 4 , and the supply tube  43 A 3  in a direction perpendicular to the bottom surface  89 . In other words, the supply tube  43 A 6 , the supply tube  43 A 5 , the supply tube  43 A 4 , and the supply tube  43 A 3  are aligned in an up-and-down direction. With this, it is easier to prevent the space  103  ( FIG. 12 ), which is necessary for piping the supply tube  43 , from spreading along the bottom surface  89  of the tank  9 . 
     The direction of aligning the supply tube  43 A 6 , the supply tube  43 A 5 , the supply tub e 43 A 4 , and the supply tube  43 A 3  is not limited to the up-and-down direction. The direction of aligning the supply tube  43 A 6 , the supply tube  43 A 5 , the supply tube  43 A 4 , and the supply tube  43 A 3  can be zigzag, as long as the supply tube  43 A 6 , the supply tube  43 A 5 , the supply tube  43 A 4 , and the supply tube  43 A 3  are shifted in the up-and-down direction. Further, a plane on which the support section  117  supports the supply tube  43  is not limited to the bottom surface  89 , but can be other side surfaces. 
     At the tank  9 , in order to increase the number of the supply tubes  43  which can be inserted to the opening  93 , while bent of the supply tubes  43  is prevented, it is necessary to increase the size of the opening  93  along the bottom surface  89 , in other words in the −X axis direction. In other words, at the tank  9 , it is difficult to insert altogether four of the supply tubes  43  connected to four of the tanks  9 , which are continuously aligned, to the opening  93 . This is from the standpoint of preventing the bent or the collapse of the supply tube  43 . 
     In contrast to this, in accordance with an arrangement in which the support section  117  ( FIG. 17 ) is configured at the tank unit  71 , at least two of the plurality of supply tubes  43  can be aligned in a direction intersecting the bottom surface  89  and supported. With this, it is possible to avoid the two of the supply tubes  43  being aligned parallel to the bottom surface  89 , and therefore it is easier to prevent the space  103  which is necessary for piping the plurality of supply tubes  43  from expanding along the bottom surface  89 . As a result, because it is easier to miniaturize the ink supply device  5 , it is easier to miniaturize the liquid ejection system  1  of the printer  3 . 
     Further, at the support section  117 , the plurality of supply tubes  43  are aligned in the direction intersecting the bottom surface  89 , it is easier to set a distance between the bottom surface  89  and the plurality of supply tubes  43  to be a designed distance. When the plurality of support members  105  for which distances between the bottom surface  89  and the opening  111  of the support member  105  are different to each other are prepared, it is easier to set the distance between the bottom surface  89  and the plurality of supply tubes  43  to be a desired distance. With this, for example, it is easier to set a water head difference between the print head  47  and the ink supply device  5 A to be a desired water head difference. 
     Also, a part of the opening  119  of the support section  117  is constituted by the notch  113  of the support member  105 . The notch  113  is open in the Z axis direction. For this reason, after the supply tube  43  is inserted to the opening  93  ( FIG. 15 ), the support member  105  can be equipped to the tank  9 . The notch  113  can be inserted in the Z axis direction to the supply tube  43  which has been inserted to the opening  93 . With this, for example, after the supply tube  43  is inserted to the opening  111  of the support member  105 , and after another supply tube  43  is inserted to the opening  93  of the tank  9  as well, it is possible to equip the support member  105  to the tank  9 . For this reason, for a method of assembly (order) of the tank unit  71 , a plurality of combinations can be prepared. At the support section  117 , the opening  119  ( FIG. 16 ) is constituted by the opening  93  of the tank  9  and the notch  113  of the support member  105 ; however, the arrangement of the opening  119  is not limited to this. As the opening  119 , an example of an arrangement in which only notch constitutes the opening  119  for example can be employed. With this arrangement, it is fine when the notch  113  as the opening  119  is merely inserted to the supply tube  43  in the −Z axis direction. 
     The flow passage opening/closing device  75 , as shown in  FIG. 18 , in a path of the supply tube  43 A 6 , the supply tube  43 A 5 , and the supply tube  43 A 4 , is provided closer to an opposite side of tank  9  than the support member  105 , namely closer to a side of the print head  47  ( FIG. 5 ) than the support member  105 . As mentioned above, at the six of the tanks  9  of the tank unit  71 , the flow passage opening/closing device  75  is provided at a part of the space of the gap between the side wall  87  and the side wall  88 . At the ink supply device  5 A, the flow passage opening/closing device  75  is provided to lie astride the tank  9 A 2  to the tank  9 A 1  in the Y axis direction. 
     The flow passage opening/closing device  75 , as shown in  FIG. 19 , includes a tube support section  131 , a passing member  133 , a cam member  135 , an operation knob  137 , and a cover  139 . The tube support section  131  is provided closer to a side of the −Z axis direction than the six of the supply tubes  43 . The pressing member  133  is provided on an opposite side of the tube support section  131  of the six of the supply tubes  43 , namely provided closer to a side of the Z axis direction than the six of the supply tubes  43 . The cam member  135  is provided on an opposite side of the tube support section  131  of the prepress member  133 , namely provided closer to the side of the Z axis direction than the pressing member  133 . The cover  139  is provided on an opposite side of the tube support section  131  of the cam member  135 , namely closer to the side of the Z axis direction than the cam member  135 . 
     At the tube support section  131 , a plurality of grooves  141  are arranged. The plurality of grooves  141  are aligned along the Y axis. In the groove  141 , the supply tube  43  is inserted. The supply tube  43 , as shown in  FIG. 20 , is deployed in the groove  141  along the groove  141 . With this, the six of the supply tubes  43  are aligned at the tub support section  131  along the Y axis. The pressing member  133  has a length covering the plurality of grooves  141  of the tube support section  131 . For this reason, the pressing member  133  has the length covering the six of the supply tubes  43  which are aligned along the Y axis at the tube support section  131 . By the way, the operation knob  137  shown in  FIG. 19  is provided attachably to the cam member  135 . When the operation knob  137  is attached to the cam member  135 , as shown in  FIG. 20 , the cam member  135  and the operation knob  137  are integrally arranged. The operation knob  137 , as shown in  FIG. 4 , is exposed outside the tank case  7 . When the user pinches the operation knob  137  by fingers and rotates the operation knob  137 , the cam member  135  is rotated in conjunction with the rotation of the operation knob  137 . 
     At the support section  131 , as shown in  FIG. 21 , a recessed section  143 , to which the pressing member  133  can be inserted, is provided. In the present embodiment, the pressing member  133  can be inserted in the recessed section  143  to a position at which the pressing member  133  abuts a bottom part of the recessed section  143 . At the pressing member  133 , a guided section  145  is provided. Also, at the tube support section  131 , a guide section  147  to which the guided section  145  can be inserted is provided at a place opposing to the guided section  145  of the pressing member  133 . By inserting the guided section  145  of the pressing member  133  to the guide section  147  of the tube support section  131 , it is possible to insert the pressing member  133  in the recessed section  143  of the tube support section  131 . 
     In a state in which the guided section  145  of the pressing member  133  is inserted in the guide section  147  of the tube support section  131 , a space is formed between the guided section  145  and the guide section  147 . Further, in the state in which the pressing member  133  is inserted in the recessed section  143 , it is set to form the space between the pressing member  133  and the recessed section  143 . For this reason, it is possible to insert smoothly the pressing member  133  in the recessed section  143 , and to remove smoothly the pressing member  133  from the recessed section  143 . Further, when inserting or removing the pressing member  133  in or from the recessed section  143 , the guided section  145  of the pressing member  133  is guided by the guide section  147  of the tube support section  131 . For this reason, it is possible to lower the misalignment of the pressing member  133  with respect to the tube support member  131  along the XY plane. 
     The pressing member  133 , as shown in  FIG. 22 , in a state in which the supply tube  43  is deployed in the groove  141  of the tube support section  131 , is provided to be opposing to the recessed section  143  ( FIG. 21 ) across the supply tube  43 . With this, the six of the supply tubes  43  are sandwiched by the tube support section  131  and the pressing member  133 . Here, the pressing member  133  is sectionalized into a first region  148  and a second region  149 . The first region  148  is a region which intersects the supply tube  43 A 1 , the supply tube  43 A 2 , and the supply tube  43 A 3  out of the six of the supply tubes  43  which are deployed in the tube support section  131 . The second region  149  is a region which intersects the supply tube  43 A 4 , the supply tube  43 A 5 , and the supply tube  43 A 6  out of the six of the supply tubes  43  which are deployed in the tube support section  131 . 
     The cam member  135  includes, as shown in  FIG. 22 , a shaft section  161 , a first cam  163 , and a second cam  165 . The shaft section  161  extends along the Y axis, and has a length covering, at the support section  131 , the six of the supply tubes  43  along the Y axis. Each of the first cam  163  and the second cam  165  is provided on the shaft section  161 . The first cam  163  and the second cam  165  are aligned along the Y axis. The first cam  163  is provided closer to a side of operation knob  137  than the second cam  165 , namely provided closer to the side of the Y axis direction than the second cam  165 . The first cam  163  is provided at a place opposing to the first region  148  of the pressing member  133 . The second cam  165  is provided at a place opposing to the second region  149  of the pressing member  133 . Further, the cam member  135 , as shown in  FIG. 23 , is provided at a place where it is possible to abut the pressing member  133 . At this time, the first cam  163  of the cam member  135  can abut the first region  148  ( FIG. 22 ) of the pressing member  133 . Further, the second cam  165  can abut the second region  149  ( FIG. 22 ) of the pressing member  133 . 
     The shaft section  161  of the cam member  135  has an axial shape and, as shown in  FIG. 24  which is a cross-sectional view of A-A line in the  FIG. 23 , has a circular outer periphery with a point J as the center. Each of the first cam  163  and the second cam  165  has an outer periphery including a profile of a circular arc with a point K as the center. The point J and the point K are mutually misaligned. In other words, the centers of the shaft section  161  and the first cam  163  are mutually misaligned (being eccentric). Also, the centers of the shaft section  161  and the second cam  165  are also mutually misaligned (being eccentric). The cam member  135  is rotated with the shaft section  161  as the center in conjunction with the rotation of the operation knob  137 . 
     At this time, since the point J and the point K are mutually misaligned, the outer peripheries of the first cam  163  and the second cam  165 , as shown in  FIG. 25 , are being shifted in conjunction with the rotation of the shaft section  161 . With this, the first cam  163  and the second cam  165  function as a cam by going up and down with the shaft section  161  as the center of rotation. In  FIG. 24 , a state in which the first cam  163  and the second cam  165  go up and down is shown. On the other hand, in  FIG. 25 , a state in which the first cam  163  and the second cam  165  are down is shown. 
     The pressing member  133 , as shown in  FIG. 24 , is provided on the outer periphery of the supply tube  43 . At this time, as shown in  FIG. 26  which is a cross-sectional view of B-B line in the  FIG. 23 , the channel  168  of the supply tube  43  is opened. When the first cam  163  and the second cam  165  go down, the pressing member  133 , as shown in  FIG. 25 , comes down towards a side of the supply tube  43  in conjunction with the first cam  163  and the second cam  165  going down. With this, supply tube  43  is collapsed by the pressing member  133 . Here, the supply tube  43  is made of a material having elasticity. As a result, the channel  168  of the supply tube  43 , as shown in  FIG. 27 , is closed. By the way, at this time, the channel  168  of the supply tube  43  does not have to be completely closed. When the first cam  163  and the second cam  165  comes up after the first cam  163  and the second cam  165  go down, as shown in  FIG. 24 , the pressing member  133  goes up by the elasticity of the supply tube  43 . With this, a passage of the supply tube  43  is opened ( FIG. 26 ) 
     The cover  139 , as shown in  FIG. 28 , is arranged to be engageable with the tube support section  131 , and covers the pressing member  133  ( FIG. 22 ), the first cam  163 , and the second cam  165  from the side of the Z axis. With this, the pressing member  133  ( FIG. 22 ), the first cam  163 , and the second cam  165  are protected by the cover  139 . 
     It is possible to open and close the channel  168  of the six of the supply tubes  43  by the flow passage opening/closing device  75 . With this, for example, when moving or transferring the liquid ejection device  1 , it is easier to prevent the ink from leaking from the print head  47 , as long as the channel  168  is closed by the flow passage opening/closing device  75 . When moving or transferring the liquid ejection device  1 , shakes or shocks are applied to the ink inside the supply tube  43  of the tank  9 . When shakes or shocks are applied to the ink inside the supply tube  43  of the tank  9 , pressure is applied to the ink in the print head  47 . For this reason, when the liquid ejection device  1  is moved or transferred, the ink may be leaking from the print head  47 . For things like this, the flow passage opening/closing device  75  is effective. As long as the channel  168  is closed by the flow passage opening/closing device  75  before moving to transferring the liquid ejection device  1 , it is possible to keep pressure fluctuation applied to the ink in the print head  47 . For this reason, it is possible to keep leakage of the ink low from the print head  47 . Also, for example, it is also effective to close the channel  168  by the flow passage opening/closing device  75  before injecting the ink in the tank  9 . This is because it is possible to keep the pressure fluctuation applied to the ink in the print head  47  low, when changing the tank  9  from the using posture to the injecting posture. 
     EXAMPLE 2 
     An ink supply device  5 B of Example 2 will be described. In Example 2, for the same arrangements which are described in Example 1, the same symbols as ones in Example 1 are used, and detailed descriptions are omitted. The ink supply device  5 B of Example 2, as shown in  FIG. 29 , includes the tank case  7 , the plurality of the supply tubes  43 , the tank unit  191 , the support frame  73 , and the flow passage opening/closing device  193 . The tank unit  191  includes the plurality of tanks  9  which are connected to each other. For the ink supply device  5 B of Example 2, five of the tanks  9  are includes in the tank unit  191 . In other words, of the tank unit  191  of Example 2, the five of the tanks  9  are connected. 
     Of the tank unit  191  shown in  FIG. 29 , a kind of the ink is different for each of the tanks  9 . For the ink supply device  5 B, four kinds of black, yellow, magenta, and cyan are employed as a kind of the ink. Black ink is stored in two of the tanks  9  out of five of the tanks  9 . For each of other three of the tanks  9 , yellow ink, magenta ink, or cyan ink is stored. The black ink is stored in the tank  9 B 4  which is fourth and in the tank  9 B 5  which is fifth from the tank  9 B 1  of the tank unit  191  in the −Y axis direction being located closest to the side of the Y axis direction. By the way, the arrangement of each of the tanks  9  is the same as one in Example 1; therefore, the detailed description is omitted. 
     For the ink supply device  5 B, the supply tube  43  is provided for each of the tanks  9 . For this reason, for the ink supply device  5 B, five of the supply tubes  43  are provided. The tank unit  191  is supported by the support frame  73 . Of the tank unit  191 , each of the tanks  9  is secured to the support frame  73  by screws. Also, the tank case  7  is secured to the support frame  73  by screws. The tank unit  71  is stored in a region surrounded by the support frame  73  and the tank case  7 . 
     Like in Example 1, the space  103  is formed between the bottom surface  89  ( FIG. 11 ) of the tank  9  and the bottom surfaces  101  of the support frame  73 . In Example 2, the supply tube  43  connected to the supply port  86  of the tank  9  is piped in the space  103  ( FIG. 12 ). Further, in Example 2, at least a part of the supply tube  43  of the plurality of the supply tubes  43  is piped in a state of being inserted to the opening  93  of the side wall  91  having the frame shape. With this, it is possible to keep low the plurality of the supply tubes  43  from spreading in the space  103 . 
     In the tank unit  191 , the support member  195  is provided, as shown in  FIG. 30 . The support member  195  supports three of the supply tubes  43  out of the five of the supply tubes  43  in the Z axis direction. The support member  195  is provided in the tank  9 B 3  which is third from the tank  981  of the tank unit  191  located closest to the side of the Y axis direction. The support member  195  supports the supply tube  43 B 5  connected to the tank  9 B 5 , the supply tube  43 B 4  connected to the tank  9 B 4  next to the tank  9 B 5 , and the supply tube  43 B 3  connected to the tank  9 B 3  next to the tank  9 B 4 . 
     The supply tube  43 B 5  connected to the tank  9 B 5  extends to the support member  195  passing through the opening  93 B 5  of the tank  9 B 5  and the opening  9384  of the tank  9 B 4 . The supply tube  43 B 4  extends to the support member  195  passing through the opening  93 B 4  of the tank  9 B 4 . In the tank unit  191 , one support member  195  is provided, but the number of the support member  195  is not limited to one. An arrangement in which, for example, the plurality of support members  195  are provided as the tank unit  191  can be employed. 
     The support member  195 , as shown in  FIG. 31 , is provided on the side wall  91  of the tank  9 . The support member  195 , as shown in  FIG. 32 , is arranged to be attachable to and detachable from the tank  9 . The support member  195 , like in Example 1, includes the pair of the fitting sections  107  and the engagement section  109 . Also, like in Example 1, the notch  113  is provided at the support member  195 . On the other hand, the support member  195  is different from one in Example 1 for including a joint section  196 . At the support member  195 , two of the joint sections  196  are provided. The number of the joint sections  196  is not limited to two, but can be one, or more than three. Hereinafter, in order to identify the two of the joint sections  196 , each of the two of the joint sections  196  is shown as a joint section  196 A and a joint section  196 B. 
     The joint section  196  extends, as shown in  FIG. 33 , along the Y axis. At the joint section  196 , the first fitting section  197  and the second fitting section  198  are provided. As shown in  FIG. 34  which is a cross-sectional view of C-C line in  FIG. 33 , at the joint section  196 , a through-hole  199  penetrating through the joint section  196  along the Y axis. To each of the first fitting section  197  and the second fitting section  198 , the supply tube  43  is coupled. The supply tube  43  coupled to the first fitting section  197  and the supply tube  43  coupled to the second fitting section  198  are communicated via the through-hole  199  to each other. With this, the joint section  196  is arranged to be capable of coupling the two of the supply tubes  43 . Hereinafter, the supply tube  43  which is coupled with the second fitting section  198  is denoted as an extension tube  43 E. 
     In Example 2, width of the first fitting section  197  and width of the second fitting section  198  are different to each other. In this example, the width of the second fitting section  198  is wider than the width of the first fitting section  197 . For this reason, width of an extension tube  43 E coupled to the second fitting section  198  is larger than the width of the supply tube  43  coupled to the first fitting section  197 . For this reason, the channel  168  of the extension tube  43 E coupled to the second fitting section  198  is wider than the channel  168  of the supply tube  43  coupled to the first fitting section  197 . In Example 2, as shown in  FIG. 35 , each of the supply tube  43 B 4  and the supply tube  43 B 5  is connected to the extension tube  43 E via the support member  195 . 
     The support member  195  having the above mentioned arrangements, as shown in  FIG. 36 , is equipped on the side wall  91  of the tank  9 . In a state in which the support member  195  is equipped on the tank  9 , the support member  195  and the side wall  91  constitute the support section  117 . From a state in which the support member  195  is equipped to the tank  9 , the engagement of the engagement section  109  is released, the support member  105  is moved in the −Z axis direction with respect to the tank  9 , and therefore it is possible to remove the support member  195  from the tank  9 . 
     In a state in which the support member  195  is equipped to the tank  9 , the notch  113  overlaps the opening  93  of the tank  9 . Then, the opening  93  and the notch  113  constitute the opening  119 . In  FIG. 36 , in order to understand the arrangements better, a region of the opening  119  is hatched. The opening  119  is set to be in a size, such that the supply tube  43  can be inserted. The supply tube  43  inserted in the opening  119  is supported in the Z axis direction by the opening  119 . Also, a change amount in the X and −X axis direction of the supply tube  43  inserted in the opening  119  is limited by the opening  93  and the support member  105 . 
     In the opening  119 , as shown in  FIG. 37 , the supply tube  4383  connected to the tank  9 B 3  is inserted. With this, the supply tube  43 B 5 , the supply tube  43 B 4 , and the supply tube  43 B 3  of the plurality of the supply tubes  43 , and two of the extension tubes  43 E are supported by the support section  117 . The support section  117  supports on the bottom surface  89  the supply tube  43 B 5 , the supply tube  43 B 4 , the supply tube  43 B 3 , and the two of the extension tube  43 E. By the support section  117 , the supply tube  43 B 3  is shifted towards the Z axis direction further than the supply tube  43 B 5  and the supply tube  43 B 4 . In other words, the support section  117  aligns in the direction intersecting the bottom surface  89  the supply tube  43 B 5 , the supply tube  43 B 4 , and the supply tube  43 B 3 , and supports thereon. In other words, the supply tube  43 B 5 , the supply tube  43 B 4 , and the supply tube  43 B 3  are aligned in the up-and-down direction. By this, it is easier to avoid the space  103  ( FIG. 12 ) expanding, which is necessary for piping the supply tube  43 , along the bottom surface  89  of the tank  9 . 
     The support section  117  of Example 2 attains similar effects to the ones of the support section  117  of Example 1. The direction of aligning the supply tube  43 B 5 , the supply tube  43 B 4 , and the supply tube  43 B 3  is not limited to the up-and-down direction along the Z axis. The direction of aligning the supply tube  43 B 5 , the supply tube  43 B 4 , and the supply tube  43 B 3  can be zigzag, as long as the supply tube  43 B 5 , the supply tube  43 B 4 , and the supply tube  43 B 3  are not aligned in the up-and-down direction. Also, a surface on which the support section  117  supports the supply tube  43  is not limited to the bottom surface  89 , but can be a different side plane. Also, the width of the supply tube  43  and the width of the extension tube  43 E are not limited to the above, an arrangement in which the width of the supply tube  43  is wider than the width of the extension tube  43 E can be employed. Further, an arrangement in which the width of the supply tube  43  as large as the width of the extension tube  43 E can be employed. 
     The flow passage opening/closing device  193 , as shown in  FIG. 38 , in the path of the supply tube  43 B 5 , the supply tube  43 B 4 , and the supply tube  43 B 3 , is provided closer to an opposite side of the tank  9  than the support member  195 , namely provided closer to the side of the print head  47  ( FIG. 5 ) than the support member  195 . Like in Example 1, the flow passage opening/closing device  193 , at the five of the tanks  9  of the tank unit  191 , is provided at a part of the space of the gap between the side wall  87  and the side wall  88 . At the ink supply device  5 B, the flow passage opening/closing device  193  is provided astride the tank  9 B 2  and the tank  9 B  1  in the Y axis direction. 
     The flow passage opening/closing device  193 , as shown in  FIG. 39 , includes a tube support section  201 , a pressing member  203 , a cam member  205 , the operation knob  137 , and a cove  207 . The tube support section  201  is provided close to the −Z axis direction than the supply tube  43 B 1 , the supply tube  43 B 2 , the supply tube  43 B 1 , and the two of the extension tubes  43 E. The tube support section  201  is sectionalized into the first tube support section  201 A, and a second tube support section  201 B. The pressing member  203  is provided closer to the opposite side of the tube support section  201  than the supply tube  43 B 1 , the supply tube  43 B 2 , the supply tube  43 B 1 , and the two of the extension tubes  43 E. The pressing member  203  includes a first pressing member  203 A and a second pressing member  203 B. The first pressing member  203 A and the second pressing member  203 B are mutually independently provided. The cam member  205  is provided on the opposite side of the tube support section  201  of the pressing member  203 , namely on the side of the Z axis direction of the pressing member  203 . The cover  207  is provided on the opposite side of the tube support section  201  of the cam member  205 , namely on the side of the Z axis of the cam member  205 . 
     At the first support section  201  A of the tube support section  201 , a plurality of grooves  221  are provided. At the second tube support section  201 B, a plurality of grooves  223  are provided. The first tube support section  201   a  is a region in which the plurality of grooves  221  are provided. The second tube support section  201 B is a region in which the plurality of groove  223  are provided. The plurality of grooves  221  are aligned at the first tube support section  201 A along the Y axis. The plurality of grooves  223  are aligned at the second tube support section  201 B along the Y axis. In each of the grooves  221 , each of the supply tube  43 B 1 , the supply tube  43 B 2 , and supply tube  43 B 1  of the plurality of the supply tubes  43  is inserted. The extension tube  43 E is inserted in each of the grooves  223 . 
     The supply tube  43 B 1 , the supply tube  43 B 2 , and the supply tube  43 B 1 , as shown in  FIG. 40 , are deployed in the groove  221  along the groove  221 . For this reason, the supply tube  43 B 1 , the supply tube  43 B 2 , and the supply tube  43 B 1  are supports by the first tube support section  201 A ( FIG. 39 ) of the tube support section  201 . Also, each of the extension tubes  43 E is deployed in the groove  223  along the groove  223 . For this reason, each of the extension tubes  43 E is supported by the second tube support section  201 B ( FIG. 39 ) of the tube support section  201 . By the above, the supply tube  43 B 1 , the supply tube  43 B 2 , the supply tube  43 B 1 , and the two of the extension tubes  43 E are aligned at the tube support section  201  along the Y axis. 
     The first pressing member  203 A, as shown in  FIG. 40 , extends along the Y axis, and at the tube support section  201  intersects the supply tube  43 B 1 , the supply tube  43 B 2 , and the supply tube  43 B 1 . The first pressing member  203 A has length to stride the supply tube  43 B 1 , the supply tube  43 B 2 , and the supply tube  43 B 1  along the Y axis. The second pressing member  203 B extends along the Y axis, and on the tube support section  201  intersects with the two of the extension tubes  43 E. The second pressing member  203 B has length to stride the two of the extension tubes  43 E along the Y axis. 
     At the tube support section  201 , as shown in  FIG. 41 , a recessed section  231  to which the pressing member  203  can be inserted is provided to stride the first tube support section  201 A and the second tube support section  201 B. In the present example, at the first tube support section  201 A, the first pressing member  203 A can be inserted in the recessed section  231  until a position at which the first pressing member  203 A abuts a bottom part of the recessed section  231 . Also, at the second tube support section  201 B, the second pressing member  203 B can be inserted in the recessed section  231  until a position at which the second pressing member  203 B abuts a bottom part of the recessed section  231 . At the first pressing member  203 A, a guide section  233 A and a guided section  233 B are provided. At the second pressing member  203 B, a guided section  235 A and a guided section  235 B are provided. 
     Also, at the tube support section  201 , a guide section  237  in which the guided section  233 A can be inserted is provided at a position opposing to the guided section  233 A of the first pressing member  203 A. At the tube support section  201 , a guide section  238  in which the guided section  235 A can be inserted is provided at a position opposing to the guided section  235 A of the second pressing member  203 B. Then, at the tube support section  201 , a guide section  239  in which the guided section  233 B and the guided section  235 B can be inserted is provided at a position opposing to the guided section  233 B of the first pressing member  203 A and the guided section  235 B of the second pressing member  203 B. 
     At the first pressing member  203 A and the tube support section  201 , the first pressing member  203 A can be inserted in the recessed section  231  of the tube support section  201  by inserting the guided section  233 A in the guide section  237 . Further, at the second pressing member  203 B and the tube support section  201 , the second pressing member  203 B can be inserted in the recessed section  231  of the tube support section  201  by inserting the guided section  235 A in the guide section  238  and inserting the guided section  235 B in the guide section  239 . 
     In a state in which the first pressing member  203 A is inserted in the recessed section  231 , it is set to form a space between the first pressing member  203 A and the recessed section  231 . Further, in a state in which the first pressing member  203 A is inserted in the recessed section  231 , spaces are formed between the guided section  233 A and the guide section  237 , and between the guided section  233 B and the guide section  239 . In a state in which the second pressing member  203 B is inserted in the recessed section  231 , it is set to form a space between the second pressing member  203 B and the recessed section  231 . Further, in a state in which the second pressing member  203 B is inserted in the recessed section  231 , spaces are formed between the guided section  235 A and the guide section  238 , and between the guided section  235 B and the guide section  239 . 
     For this reason, it is possible to insert the pressing member  203  in the recessed section  231  smoothly, and removing the pressing member  203  from the recessed section  231  smoothly. Also, when inserting and removing the pressing member  203  in and from the recessed section  231 , the guided section  233 A is guided by the guide section  237 , the guided section  235 A is guided by the guide section  238 , and the guided section  233 B and the guided section  235 B are guided by the guide section  239 . For this reason, it is possible to keep lower the misalignment of the pressing member  203  with respire to the tube support section  201  along the XY plane. 
     The first pressing member  203 A, as shown in  FIG. 42 , in a state in which the supply tube  43  is deployed in the groove  221  of the tube support section  201  ( FIG. 41 ), is provided at a position opposing to the recessed section  231  ( FIG. 41 ) across the supply tube  43 . With this, three of the supply tubes  43  are sandwiched by the tube support section  201  and the first pressing member  203 A. The second pressing member  203 B, as shown in  FIG. 42 , in a state in which the extension tube  43 E is deployed in the groove  223  ( FIG. 41 ) of the tube support section  201 , is provided at a position oppose to the recessed section  231  ( FIG. 41 ) across the extension tube  43 E. With this, the two extension tubes  43 E are sandwiched by the tube support section  201  and the second pressing member  203 B. The length of the first pressing member  203 A along the Y axis and the length of the second pressing member  203 B along the Y axis are set to be substantially same to each other. With this, it is easy to align in response to the supply tube  43  and the extension tube  43 E, and manufacturing becomes easy. 
     The cam member  205 , as shown in  FIG. 42 , includes a shaft section  251 , a first cam  253 , and a second cam  255 . The shaft section  251  extends along the Y axis, and has length covering, at the tube support section  201 , the three of the supply tubes  43  and the two of the extension tubes  43 E along the Y axis. Each of the first cam  253  and the second cam  255  is provided on the shaft section  251 . The first cam  253  and the second cam  255  are aligned along the Y axis. The first cam  253  is provided closer to the side of the operation knob  137  than the second cam  255 , namely closer to the side of the Y axis direction than the second cam  255 . The first cam  253  is provided at a position opposing to the first pressing member  203 A. The second cam  255  is provided at a position opposing to the second pressing member  203 B. Then, the cam member  205 , as shown in  FIG. 43 , is provided at a position at which the first pressing member  203 A and the second pressing member  203 B can be abutted. At this time, the first cam  253  of the cam member  205  can abut the first pressing member  203 A. Also, the second cam  255  can abut the second pressing member  203 B. 
     The shaft section  251  of the cam member  205 , as shown in  FIG. 44  which is a cross-sectional view of D-D line in  FIG. 43 , has an axial shape, and a circular outer periphery with a line J 1  as the center. The first cam  253  has an outer periphery including a profile of a circular arc with a line K 1  as the center. The second cam  255  has an outer periphery including a profile of circular arc with a line L 1  as the center. The line J 1 , the lien K 1 , and the line L 1  are mutually misaligned. In other words, the centers of the shaft section  251  and the first cam  253  are mutually misaligned (being eccentric). Further, the centers of the shaft section  251  and the second cam  255  are mutually misaligned (being eccentric). Further, the centers of the first cam  253  and the second cam  255  are mutually misaligned (being eccentric). The first cam  253  and the second cam  255 , as shown in  FIG. 45  which shows schematically a cross-section of the first cam  253  and the second cam  255  in the XZ plane, have cross-sections which are substantially homologous and are different in size. The cross-section of the second cam  255  is larger than the cross-section of the first cam  253 . 
     The cam member  205  is rotated with the shaft section  251  as the center in conjunction with the rotation of the operation knob  137  ( FIG. 43 ). At this time, because the line J 1 , the line K 1 , and the line L 1  are misaligned, the outer peripheries of the first cam  253  and the second cam  255  are moved in conjunction with the rotation of the shaft section  251 , as shown in  FIG. 46 . With this, the first cam  253  and the second cam  255  function as a cam by going up and down with the shaft section  251  as the center of rotation. As mentioned above, because the cross-section of the second cam  255  is larger than the cross-section of the first cam  253 , and because the line K 1  and the line L 1  are misaligned, the change amount of the second cam  255  is larger than the change amount of the first cam  253 . In other words, the change mount in going up and down of the second cam  255  is larger than the change amount in going up and down of the first cam  253 . By the way,  FIG. 44  shows a state of the first cam  253  and the second cam  255  in going up and down. On the other hand,  FIG. 46  shows a state of the first cam  253  and the second cam  255  are down. 
     The first pressing member  203 A, as shown in  FIG. 44 , is provided on the outer peripheries of the supply tube  43 B 1 , the supply tube  43 B 2 , and the supply tube  43 B 3 . At this time, the channel  168  of each of the supply tube  43 B 1 , the supply tube  43 B 2 , and the supply tube  43 B 3  is opened. Also, the second pressing member  203 B is provided on the outer peripheries of the two extension tubes  43 E. At this time, the channel  168  of each of the two extension tubes  43 E is opened. 
     When the first cam  253  goes down, the first pressing member  203 A, as shown in  FIG. 46 , goes down towards the side of the supply tube  43  in conjunction with the first cam  253  going down. With this, the supply tube  43 B  1 , the supply tube  43 B 2 , and the supply tube  43 B 3  are collapsed by the first pressing member  203 A. Further, when the second cam  255  goes down, the second pressing member  203 B goes down towards the side of the extension tube  43 E in conjunction with the second cam  255  going down. With this, the two extension tubes  43 E are collapsed by the second pressing member  203 B. As a result of this, the channel  168  ( FIG. 44 ) of each of the supply tube  43 B 1 , the supply tube  43 B 2 , the supply tube  43 B 3 , and the two extension tubes  43 E is closed. By the way, at this time, the channel  168  does not have to be completely closed. 
     Then, when the first cam  253  and the second cam  255  go up after the first cam  253  and the second cam  255  go down, each of the first pressing member  203 A and the second pressing member  203 B goes up, as shown in  FIG. 44 , by elasticity of the supply tube  43  and the extension tube  43 E. With this, the passage of the supply tube  43 B 1 , the supply tube  43 B 2 , the supply tube  43 B 3 , and the two of the extension tubes  43 E is opened. 
     The cover  207 , as shown in  FIG. 47 , is arranged to be engageable with the tube support section  201 , and covers the pressing member  203  ( FIG. 39 ), the first cam  253 , and the second cam  255  from the side of the Z axis direction. With this, the pressing member  203  ( FIG. 39 ), the first cam  253 , and the second cam  255  are protected by the cover  207 . Example 2 which is mentioned above attains the same effect as in Example 1. In Example 1, each of the supply tube  43 B 1 , the supply tube  43 B 2 , and the supply tube  43 B 3  corresponds to a first tube, and the extension tube  43 E corresponds to a second tube. Also, the shaft section  251  corresponds to a motion section, the operation knob  137  corresponds to a control section, the guide section  239  corresponds to a guide section, and the cover  207  corresponds to a protection cover. The flow passage opening/closing device  193  in Example 2 can attain the same effect as the flow passage opening/closing device  75  of Example 1. 
     EXAMPLE 3 
     For the flow passage opening/closing device  75  of Example 1, an arrangement of driving the passage member  133  by the cam member  135  is employed. Also, for the flow passage opening/closing device  193  of Example 2, an arrangement of driving the pressing member  203  by the cam member  205  is employed. However, the arrangements of the flow passage opening/closing device  75  and the flow passage opening/closing device  193  are not limited to these. For the arrangements of the flow passage opening/closing device  75  and the flow passage opening/closing device  193 , an arrangement in which the cam member  135  and the cam member  205  are omitted can be employed. For the arrangement in which the cam member  135  and the cam member  205  are omitted from the flow passage opening/closing device  75  and the flow passage opening/closing device  193 , the flow passage opening/closing device  75  as an example in Example 3 will be described. In Example 3, detailed description of the same arrangements which are described in Example 1 and Example 2 will be omitted by using the same symbols as in Example 1 and Example 2. 
     The flow passage opening/closing device  281  of Example 3, as shown in  FIG. 48 , includes a tube support section  283 , a pressing member  285 , and a cover  287 . For the flow passage opening/closing device  281 , the cam member  135  of the flow passage opening/closing device  75 , and the cam member  205  of the flow passage opening/closing device  193  are omitted. In the tube support section  283 , the plurality of grooves  141  are provided, like in Example 1. The plurality of grooves  141  can be grooves  221  or the grooves  223  of Example 2. The pressing member  285  is provided on the opposite side of the tube support section  283  of the six of the supply tubes  43 , namely provided closer to the side of the Z axis direction than the supply tube  43 . The cover  287  is provided on the opposite side of the tube support section  283  of the pressing member  285 , namely provided closer to the side of the Z axis direction than the pressing member  285 . The cover  287  is same as the cover  139  of Example 1 and the cover  207  of Example 2, and therefore the detailed description is omitted. 
     The pressing member  285  includes a pressing section  288 , a control section  289 , and a locking pin  291 . At the tube support section  283 , the recessed section  143  to which the pressing member  285  can be inserted is provided, like in Example 1. The pressing section  288  of the pressing member  285  is inserted in the recessed section  143 . The control section  289  of the pressing member  285  protrudes from the pressing section  288  in the Y axis direction. The locking pin  291  is provided at an end of the pressing member  285  and protrudes along the X axis. At the tube support section  283 , a bearing (now shown in figures) in which the locking pin  291  of the pressing member  285  is inserted is provided. The pressing member  285  is arranged to be rotatable with respect to the tube support section  283  with the locking pin  291  as the center which is inserted in the bearing of the tube support section  283 . 
     When the supply tube  43  is deployed in the groove  141  and the locking pin  291  of the pressing member  285  is inserted in the bearing of the tube support section  283 , as shown in  FIG. 49 , of the pressing member  285 , the pressing section is provided on the supply tube  43  and stands still in a state of inclining with respect to the tube support section  283 . Then, when rotating the pressing member  285  in R 3  direction in the figure by operating a force of the control section  289 , as shown in  FIG. 50 , the supply tube  43  is collapsed by the pressing member  285 . With this, the channel  168  ( FIG. 26 ,  FIG. 44 ) of the supply tube  43  is closed. Like this, for the flow passage opening/closing device  281  of Example 3, the channel  168  can be opened and closed, like Example 1 or Example 2. 
     For the ink supply device  5  which is applicable to the flow passage opening/closing device  281  of Example 3, as shown in  FIG. 51 , the control section  289  is exposed from the tank case  7 . At the tank case  7 , the opening section  295  which extends along the Z axis is provided. The control section  289  is exposed from the tank case  7  via the opening section  295 . The operator or the user, as shown in  FIG. 52 , urges the control section  289  downwardly in the −Z axis direction along the opening section  295 . At the opening section  295 , a bending section  297  is provided. At the bending section  297 , the opening section  295  is bent in the X axis direction. Then, as shown in  FIG. 53 , the control section  289  can be inserted in the bending section  297 . With this, as shown in  FIG. 54 , the control section  289  can be secured (locked) to the bending section  297 . 
     In each of Example 1-Example 3, the tank unit  71  or the tank unit  191  has arrangements in which the plurality of tanks  9  are connected. However, the arrangements of the tank unit  71  or the tank unit  191  are not limited to this. For the arrangements of the tank unit  71  or the tank unit  191 , for example, an arrangement in which a liquid storing container is sectionalized into a plurality of ink storage sections (liquid storage sections) can be employed. 
     EXAMPLE 4 
     The tank  9 D of Example 4 will be described. The tank  9 D of Example 4 has an arrangement same as the ones of the tank  9  in each of Example 1-Example 3, except the arrangement of the vent portion  85  ( FIG. 9 ) of the tank  9  being different. For this reason, hereinafter, for the same arrangement of the tank  9 , description will be omitted by using the same symbols of each of Example 1-Example 3. The vent portion  85  of the tank  9 D of Example 4 is noted as the vent portion  85 D for differentiating from the vent portion  85  of the tank  9  for each Example 1-Example 3. 
     At the liquid ejection system  1 , as shown in  FIG. 3 , a slack is formed at the supply tube  43  between the ink supply device  5  and the printer  3 . Because the slack is formed at the supply tube  43 , as shown in  FIG. 6 , it is possible to overturn to the side with respect to the printer  3  of the ink supply device  5 . By the way, when the ink supply device  5  is equipped on the printer  3  (a state shown in  FIG. 1 ), the supply tube  43  which extends towards the print head  47  from the ink supply device  5 , as shown in  FIG. 55 , is stored between the ink supply device  5  and the printer  3  in a state of being bent. 
     At this time, the supply tube  43  and the vent  84  may be overlapped. When the supply tube  43  and the vent  84  are overlapped, the vent  84  may be closed by the supply tube  43 . When things like this happen, because it is difficult for the air to come in the tank  9 , and because the pressure in the tank  9  is decreased, it is difficult for the ink in the tank  9  to be supplied to the print head  47 . As a result, because printing is impeded, the liquid ejection system  1  does not perform the functions, and the reliability of the liquid ejection system  1  is possibly deteriorated. 
     The tank  9 D of Example 4, as shown in  FIG. 56 , includes a vent portion  85 D. The vent portion  85 D protrudes in the −X axis direction from the side wall  87  of the storage  81 . The vent portion  85 D is cylindrically formed. Hereinafter, the tank  9 D of Example 4 is described by showing some examples. Hereinafter, in order to identify some examples of the tank  9 D, different numbers are used for each example. 
     Example 4-1 
     The tank  9 D 1  of Example 4-1, as shown in  FIG. 56 , includes a vent portion  85 D 1 . At the vent portion  85 D 1 , as shown in  FIG. 57  which is an enlarged view of a part F in  FIG. 56 , an opening  301  which opens in a direction different from a protruding direction (in the present example, −X axis direction) in which the vent portion  85 D 1  protrudes. As shown in  FIG. 58  which is a cross-sectional view of G-G line in  FIG. 57 , even if the vent  84  is closed by the supply tube  43 , the vent channel  303  of the vent portion  85 D 1  communicates with the outside air via the opening  301  provided on the vent portion  85 D 1 . The vent channel  303  is a passage communicating from the vent  84  to the inside of the tank  9 D. With this, the inside of the tank  9 D  1  communicates the outside air. For this reason, because it is easier to maintain the pressure inside the tank  9 D 1  at the air pressure outside, it is easier to prevent lowering of the printing function. Therefore, it is easier to maintain the reliability of the liquid ejection system  1 . The number of openings  301  can be one, or more than one. 
     Example 4-2 
     The tank  9 D 2  of Example 4-2, as shown in  FIG. 59 , includes a vent portion  85 D 2 . At the vent portion  85 D 2 , as shown in  FIG. 60  which is an enlarged view of a part H in  FIG. 59 , a plurality of projection section  305  protruding towards the opposite side of the side wall  87  from an end of the vent portion  85 D 2 . As shown in  FIG. 61  which is a cross-sectional view of M-M line in  FIG. 60 , even if the supply tube  43  overlaps the vent  84 , the opening  307  is kept between the plurality of projections  305 . Via the opening  307 , the vent channel  303  of the vent portion  85 D 2  communicates with the outside air. With this, the inside of the tank  9 D 2  communicates with the outside air. For this reason, because it is easier to maintain the pressure inside the tank  9 D 2  at the outside air pressure, it is easier to prevent lowering the printing function. Therefore, it is easier to maintain the reliability of the liquid ejection system  1 . The number of the projections  305  can be one, as long as a space is ensured when the supply tube  43  overlaps the vent  84 . 
     Example 4-3 
     The tank  9 D 3  of Example 4-3, as shown in  FIG. 62 , includes a vent portion  85 D 3 . At the vent portion  85 D 3 , as shown in  FIG. 63  which is an enlarged view of a part N in  FIG. 62 , a plurality of notches  309  which is cut in towards the side of the side wall  87  from an end of the vent portion  85 D 3 . As shown in  FIG. 64  which is a cross-sectional view of Q-Q line in  FIG. 63 , even if the supply tube  43  overlaps the vent  84 , the opening  311  is maintained by the plurality of notches  309 . The vent channel  303  of the vent portion  85 D 3  communicates with the outside air via the opening  311 . With this, the inside of the tank  9 D 3  communicates with the outside air. For this reason, because it is easier to maintain the pressure inside the tank  9 D 3  at the outside air pressure, it is easier to prevent lowering the printing function. Thus, it is easier to maintain the reliability of the liquid ejection system  1 . 
     Example 4-4 
     The tank  9 D 4  of Example 4-4, as shown in  FIG. 65 , includes a vent portion  85 D 4 . At the vent portion  85 D 4 , as shown in  FIG. 66  which is an enlarged view of a part S in  FIG. 65 , a vent portion  85 D 4  includes an extension portion  313 . The extension portion  313  extends in a direction different (in the present example, the Z axis direction) from the −X axis direction being a protruding direction. Namely, in the present example, the vent portion  85 D 4  protrudes in the −X axis direction from the side wall  87 , and is bent towards the Z axis direction at the extension portion  313 . Then, the vent  84  is provided at an end of the extension portion  313 . With this, the vent  84  is open in a direction different (in the present example, the Z axis direction) from the −X axis direction being a protruding direction. For this reason, as shown in  FIG. 67  which is a cross-sectional view of T-T line in  FIG. 66 , even if the supply tube  43  overlaps the vent portion  85 D 4 , the vent channel  315  communicates with the outside air by the vent  84 . The vent channel  315  is a passage communicating from the vent  84  to the inside of the tank  9 D 4 . With this, the inside of the tank  9 D 4  communicates with the outside air. For this reason, because it is easier to maintain the pressure in the tank  9 D 4  at the outside air pressure, it is easier to prevent lowering the printing function. Thus, it is easier to maintain the reliability of the liquid ejection system  1 . The direction in which the extension portion  313  extends is not limited to the Z axis direction, but various directions can be employed. 
     Example 4-5 
     The tank  9 D 5  of Example 4 to 5, as shown in  FIG. 68 , includes a vent portion  85 D 5 . At the vent portion  85 D 5 , as shown in  FIG. 69  which is an enlarged view of a part V in  FIG. 68 , a plurality of projections  317  protruding towards the opposite side of the side wall  87  from an end of the vent portion  85 D 5  are provided. The plurality of projection section  317 , as shown in  FIG. 70  which is a cross-sectional view of W-W line in  FIG. 69 , protrudes to the −X axis direction further than an edge of the vent  84 . For this reason, even if the supply tube  43  overlaps the vent  84 , the opening  318  is maintained between the plurality of projections  317 . In other words, for the opening  318 , the vent channel  303  of the vent portion  85 D 5  communicates with the outside air via the opening  318  which opens to a different direction from the −X axis direction being protruding direction of the vent portion  85 D 5 . With this, the inside of the tank  9 D 5  communicates with the outside air. For this reason, it is easier to maintain the pressure inside the tank  9 D 5  at the outside air pressure, it is easier to prevent lowering the printing function. Thus, it is easier to maintain the reliability of the liquid ejection system  1 . The number of the projection section  317  can be one, as long as a space is ensured when the supply tube  43  overlaps the vent  84 . 
     The vent channel  303  in Example 4-1, Example 4-2, Example 4-3, and Example 4-5, as shown in  FIGS. 58, 61, 64, and 70 , is tapered in getting narrower in a direction from the outside to the inside of the tank  9 D. With this, even in a case in which the ink from the inside of the tank  9 D flows into the vent portion  85 D, because the ink is easily led to a narrower side of the vent channel  303  due to the capillary phenomenon, it is easier to avoid the leakage of the ink to the outside from the vent portion  85 D. By the way, in these examples, the vent channel  303  corresponds to a tapered portion. 
     On the tank  9 , the tank  9 A, the tank  9 B, and the tank  9 D of Example 1-Example 4, a cap member  321  ( FIG. 71 ) which is attachable to and detachable from the vent portion  85  or the vent portion  85 D is provided. The cap member  321 , as shown in  FIG. 71 , includes a cap section  323  and a knob section  325 . The cap section  323 , as shown in  FIG. 72 , can be coupled to the vent portion  85  or the vent portion  85 D. It is possible to close the vent  84  by the cap section  323  by equipping the cam member  321  to the vent portion  85  or the vent portion  85 D. With this, it is possible to render the ink difficult to evaporate from the vent  84 . The operator or the user, in a state of pinching the knob section  325  of the cap member  321 , can remove the cap member  321  from the tank  9  or the tank  9 D by pulling the cap member  321  off in the Z axis direction. 
     In each of Example 4-1, Example 4-2, Example 4-3, and Example 4-5, the cap member  321  is can be equipped to the vent portion  85 D ( 85 D 1 ,  85 D 2 ,  85 D 3 ,  85 D 5 ). When the cam member  321  is equipped to the vent portion  85 D 1  ( FIG. 57 ), the opening  301  is closed by the cap section  323 . When the cap member  321  is equipped to the vent portion  85 D 2  ( FIG. 61 ), opening  307  between the two projections  305  is closed by the cap section  323 . When the cam member  321  is equipped to the vent portion  85 D 3  ( FIG. 64 ), the opening  311  formed by the notch  309  is closed by the cap section  323 . When the cap member  321  is equipped to the vent portion  85 D 5  ( FIG. 70 ), the opening  318  between the two projections  317  is closed by the cap section  323 . Therefore, even in Example 4-1, Example 4-2, Example 4-3, and Example 4-5, it is possible to render the ink difficult to evaporate from the vent portion  85 D. 
     The cam member  321  applicable for the tank  9 D 4  of Example 4-3, as shown in  FIG. 73 , has an arrangement in which the cap section  323  is oriented in the −Z axis direction. With this, it is possible to equip the cam member  321  to the tank  9 D 4  by coupling the cap section  323  with the extension portion  313  ( FIG. 66 ). With this, even for the tank  9 D 4 , it is possible to render the ink difficult to evaporate from the vent  84 . The operator or the user, in a state of pinching the knob section  325  of the cap member  321 , can remove the cap member  321  from the tank  9 D 4  by pulling the cap member  321  off in the Z axis direction. 
     In the examples above, the liquid ejection device can be a liquid ejection device ejecting, applying, and consuming liquid other than ink. The state of liquid being ejected as a small amount of a droplet from the liquid ejection device includes a granular state, a tear-drop state, and a thread state which threads. The liquid here can be a material to be consumed by the liquid ejection device. For example, it is fine to be in a state in which a substance is in phase change, and includes body of fluid, such as liquid body with high or low viscosity, sol, gel water, other inorganic solvent, organic solvent, solution, liquid resin, and liquid metal (metallic melt). Further, not only liquid as a state of substance, but also things in which particles of functional materials are dissolved in solvent, dispersed, or mixed are included, where the functional materials are made of solid materials such as pigments or metallic grains. A typical example of the liquid can be liquid crystal or the like other than the ink which is mentioned above in each of the examples. Here, the ink includes various liquid compositions, such as ordinary aqueous ink and oil ink, as well as gel ink, and hot-melt ink. Specific examples of the liquid ejecting device, for example includes a liquid crystal display, an EL (electroluminescence) display, a plane emission display, and a liquid ejection device ejecting liquid including an electrode material used for manufacturing color filters, or a dispersed or dissolved material such as a color material or the like. Also, it can be a liquid ejection device ejecting bioorganic substance used for biochip fabrication, a liquid ejection device ejecting liquid as a sample used for precise pipette, printing device, a micro-dispenser, or the like. Further, it can be a liquid ejection device ejecting lubricant pinpoint to precision machines such as a timepiece or a camera, or a liquid ejection device ejecting transparent resin solution onto a substrate which is used for optical communication element or the like. Further, it can be a liquid ejection device ejecting etching solution of acid, alkali, or the like for etching a substrate. 
     In the conventional liquid ejection system, an air inlet (vent) is provided in the tank. The air inlet is an opening capable of introducing air inside the tank. When the ink inside the tank is consumed, a pressure inside the tank becomes lower than the air pressure outside. At this time, because the air is introduced to the inside of the tank from the air inlet, the pressure inside the tank is easily maintained at the air pressure outside. 
     Also, for the liquid ejection system, a tube for leading the ink to the ejection head from the tank is provided to be long enough in order to correspond the change of the posture from the using posture to the injecting posture. In other words, when the tank is in the using posture, the tube has a slack. With this, when the tank changes the posture, it is possible to reduce an external force being applied to the tube. As a result, when the tank changes the posture, it is possible to prevent the tube from being pulled or being collapsed. When the tank is in the using posture, the slack of the tube is stored between the tank and the liquid ejection device. 
     In this manner, in the liquid ejection system, because the tube has the slack when the tank is in the using posture, there may be a case in which the slack of the tube covers the air inlet, when the tank is changed to the injecting posture or changed to the using posture. When the slack of the tube covers the air inlet, the air inlet is blocked by the tube. When things like this happen, because the air is difficult to be introduced to the inside of the tank, and because the pressure inside the tank is decreased, the ink in the tank is difficult to be supplied to the ejection head. As a result of this, because the printing is easily impeded, the liquid ejection system does not function properly; therefore, it is possible that reliability of the liquid ejection system is impaired. Therefore, there is a problem that it is difficult for the conventional liquid storing container or the liquid ejection system to increase the reliability. 
     The present invention is conceived to solve at least a part of the above mentioned problems, and is realized in embodiments or examples below. 
     A liquid storing container according to the embodiment is adapted to supply liquid to a liquid ejection section configured and arranged eject the liquid. The liquid storing container includes a liquid storage chamber, a liquid supply opening, and a vent portion. The liquid storage chamber is configured and arranged to store the liquid. The liquid supply opening communicates with the liquid storage chamber, and configured and arranged to be connected to a tube which is connected to the liquid ejection section. The vent portion communicates with the liquid storage chamber to introduce air to the liquid storage chamber. The vent portion protrudes from a side wall of the liquid storing container. The vent portion has an opening facing in a direction different from a protruding direction of the vent portion. 
     With this example of the liquid storing container, because the opening is arranged on the vent portion to face in a direction different from the protruding direction, even if the tube comes into contact with the vent portion, it is easier to avoid covering the opening by the tube. For this reason, even if the tube is in contact with the vent portion, introducing the air to the inside of the liquid storage chamber is not impeded. In other words, even if the tube is in contact with the vent portion, it is easier to maintain communication between the liquid storage chamber and the outside air. As a result, it is easier to maintain supplying the liquid to the liquid ejection section well. Therefore, the reliability of the liquid storing container is enhanced. 
     With the liquid storing container, the opening of the vent portion is preferably disposed on a side part of the vent portion. 
     With this example, even if the tube is in contact with the vent portion in the protruding direction, it is possible to maintain the communication between the liquid storage chamber and the outside air via the opening arranged on the side part of the vent portion. 
     With the liquid storing container, the vent portion preferably includes a plurality of projections on an end of an opposite side to the side wall, the plurality of projections protruding from the end towards the opposite side to the side wall, and a space between the plurality of the projections preferably defines the opening. 
     With this example, even if the tube is in contact with the vent portion in the protruding direction, because the tube abuts the projections, it is possible to maintain the communication between the liquid storage chamber and the outside air via the opening being the space between the projections. 
     With the liquid storing container, the vent portion preferably includes an extension portion on an opposite side to the side wall, the extension portion extending in a direction different from the projecting direction, and the opening is disposed at an end of the extension portion. 
     With this example, even if the tube is in contact with the vent portion in the protruding direction, it is possible to maintain the communication between the liquid storage chamber and the outside air via the opening arranged at the extension portion extending in a direction different from the protruding direction. 
     With the liquid storing container, the vent portion preferably includes a vent channel as a passage for the air, and the vent channel includes a tapered portion tapered as becoming narrower towards inside from the outside. 
     With this example, even in a case in which the ink from the liquid storage chamber flows into the vent portion, because the ink is easily led to a narrower side of the vent channel due to the capillary phenomenon, it is easier to avoid the leakage of the ink to the outside from the vent portion. 
     With the liquid storing container, the vent portion preferably includes a cap member which is attachable and detachable, and when the cap member is attached to the vent portion, the opening is covered from the outside by the cap member. 
     With this example, because the cap member can cover the opening, it is possible to render the liquid in the liquid storage chamber difficult to evaporate from the vent portion, and render the leakage of the liquid difficult from the vent portion to the outside. 
     GENERAL INTERPRETATION OF TERMS 
     In understanding the scope of the present invention, the term “comprising” and its derivatives, as used herein, are intended to be open ended terms that specify the presence of the stated features, elements, components, groups, integers, and/or steps, but do not exclude the presence of other unstated features, elements, components, groups, integers and/or steps. The foregoing also applies to words having similar meanings such as the terms, “including”, “having” and their derivatives. Also, the terms “part,” “section,” “portion,” “member” or “element” when used in the singular can have the dual meaning of a single part or a plurality of parts. Finally, terms of degree such as “substantially”, “about” and “approximately” as used herein mean a reasonable amount of deviation of the modified term such that the end result is not significantly changed. For example, these terms can be construed as including a deviation of at least ±5% of the modified term if this deviation would not negate the meaning of the word it modifies. 
     While only selected embodiments have been chosen to illustrate the present invention, it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made herein without departing from the scope of the invention as defined in the appended claims. Furthermore, the foregoing descriptions of the embodiments according to the present invention are provided for illustration only, and not for the purpose of limiting the invention as defined by the appended claims and their equivalents.