Abstract:
With a conventional liquid container, it is difficult to reduce the possibility of soiling with liquid caused by liquid leakage. Provided is a liquid container including a liquid containing portion containing liquid, a liquid inlet portion receiving injection of the liquid into the liquid containing portion, an open air port that communicates with the liquid containing portion and is introducing the atmospheric air into the liquid containing portion, and a liquid absorbent material that is arranged at least in a portion of the periphery of the open air port and that is absorbing the liquid.

Description:
CROSS REFERENCE TO RELATED APPLICATION 
     This application claims priority to Japanese Patent Application No. 2015-109536 filed on May 29, 2015, the entire contents of this application are incorporated by reference herein. 
     BACKGROUND 
     1. Technical Field 
     The present invention relates to a liquid container, a liquid supply device, a liquid jet system and the like. 
     2. Related Art 
     As an example of a liquid jet device, inkjet printers are conventionally known. Inkjet printers can perform printing on a printing medium such as printing paper by ejecting ink, which is an example of liquid, from a jet head onto the printing medium. Conventionally, regarding such inkjet printers, configurations for supplying ink stored in a tank, which is an example of a liquid container, to the jet head are known. Such a tank is provided with an ink inlet port. A user can replenish ink in the tank through the ink inlet port. Regarding such a tank, a configuration in which a liquid containing chamber that contains ink and an air containing chamber into which air is introduced communicate with each other via a communication portion is conventionally known (for example, refer to JP-A-2012-20495). Note that in the following description, a configuration to which a liquid supply device that supplies ink to a liquid jet device such as an inkjet printer is added may be called a liquid jet system. 
     SUMMARY 
     With the tank described in JP-A-2012-20495 above, for example, even if ink in the liquid containing chamber flows out to the air containing chamber side via the communication portion, the ink that flowed out to the air containing chamber side can be stored in the air containing chamber. In such a tank, an open air port is formed to be near the upper surface portion of the air containing chamber in a use orientation. Therefore, with this tank, the ink in the liquid containing chamber is easily prevented from leaking out of the tank via the open air port. However, if the inkjet printer vibrates or rocks in the state in which the ink has flowed into the air containing chamber, the ink that flowed into the air containing chamber easily reaches the open air port. As a result, it is conceivable that the ink in the liquid containing chamber leaks out of the tank via the open air port. If the ink leaks out of the tank, the inkjet printer may be soiled with ink, or an operator working on the inkjet printer may get soiled with ink. Thus, in conventional liquid containing bodies, there is a problem in that it is difficult to reduce the possibility of soiling caused by the liquid leakage. 
     The invention has been made in order to solve at least the foregoing issue, and can be achieved as the following modes or application examples. 
     APPLICATION EXAMPLE 1 
     A liquid container includes a liquid containing portion containing a liquid, a liquid inlet portion receiving injection of the liquid into the liquid containing portion, an open air port that communicates with the liquid containing portion and is introducing atmospheric air into the liquid containing portion, and a liquid absorbent material that is arranged at least in a portion of a periphery of the open air port and is absorbing the liquid. 
     In this liquid container, the liquid absorbent material is arranged at least in a portion of the periphery of the open air port, and thus even if the liquid leaks out from the open air port, the leaked liquid can be absorbed by the liquid absorbent material. Therefore, it is possible to suppress the possibility of soiling caused by the liquid leakage to a low level. 
     APPLICATION EXAMPLE 2 
     In the above-described liquid container, the liquid absorbent material covers the open air port, and an opening portion that is open to atmospheric air is formed in the liquid absorbent material. 
     In this liquid container, the liquid absorbent material covers the open air port, and thus even if the liquid leaks out from the open air port, it is easy for the liquid absorbent material to reliably absorb the leaked liquid. Accordingly, it is possible to further suppress the possibility of soiling caused by the liquid leakage to a low level. In addition, in this liquid container, the opening portion is formed in the liquid absorbent material, and thus the open air port is easily opened to the atmospheric air. 
     APPLICATION EXAMPLE 3 
     In the above-described liquid container, assuming that an orientation when the liquid container is being used is a use orientation of the liquid container, the opening portion is positioned vertically below the open air port in the use orientation. 
     In this liquid container, in the use orientation of the liquid container, the opening portion of the liquid containing portion is positioned vertically below the open air port. Therefore, for example, in the case where the liquid container adopts an inverted orientation that is inverted from the use orientation, the opening portion of the liquid absorbent material is positioned vertically above the open air port. Accordingly, in the inverted orientation, even if the liquid leaks out from the open air port, the leaked liquid does not easily reach the opening portion of the liquid absorbent material. As a result, in the inverted orientation, even if the liquid leaks out from the open air port, it is possible to suppress the possibility of soiling caused by the liquid leakage to a low level. 
     APPLICATION EXAMPLE 4 
     In the above-described liquid container, the liquid absorbent material includes a first portion positioned in a periphery of the open air port and a second portion facing the open air port. 
     In this liquid container, liquid that leaks out to the periphery of the open air port and in a direction facing the open air port is easily absorbed by the absorbent material. 
     APPLICATION EXAMPLE 5 
     in the above-described liquid container, the first portion is separated from the second portion each other. 
     In this liquid container, the liquid absorbent material can be constituted by a plurality of members. 
     APPLICATION EXAMPLE 6 
     The above-described liquid container includes a positioning member for determining a position of the liquid absorbent material. 
     In this liquid container, the position of the liquid absorbent material is easily determined by the positioning member, and thus it is possible to easily manufacture the liquid container. 
     APPLICATION EXAMPLE 7 
     The above-described liquid container includes an absorbent material housing part housing the liquid absorbent material. 
     In this liquid container, the liquid absorbent material is easily protected by the absorbent material housing part. 
     APPLICATION EXAMPLE 8 
     A liquid jet system includes a liquid jet head jetting a liquid, a liquid container containing the liquid that is supplied to the liquid jet head, a supply tube constituting at least a portion of a supply path supplying the liquid from the liquid container to the liquid jet head, and a liquid absorbent material arranged within a liquid container mounting part to which the liquid container is mounted, wherein the liquid container includes a liquid containing portion containing the liquid, a liquid inlet portion receiving injection of the liquid into the liquid containing portion, and an open air port that communicates with the liquid containing portion and is introducing atmospheric air into the liquid containing portion, and assuming that an orientation when the liquid container is being used is a use orientation of the liquid container, the liquid absorbent material is positioned at least at a height of the open air port in the use orientation. 
     In this liquid jet system, in the use orientation of the liquid container, the liquid absorbent material is positioned at least at the height of the open air port. Therefore, even if liquid leaks out from the open air port, the leaked liquid is easily absorbed by the liquid absorbent material. Accordingly, it is possible to suppress the possibility of soiling caused by the liquid leakage to a low level. 
     APPLICATION EXAMPLE 9 
     The above-described liquid jet system includes a positioning part for determining a position of the liquid absorbent material within the liquid container mounting part. 
     In this liquid jet system, the position of the liquid absorbent material is easily determined by the positioning part, and thus it is possible to prevent the position of the liquid absorbent material from being easily displaced. 
     APPLICATION EXAMPLE 10 
     In the above-described liquid jet system, the positioning part is provided on the liquid container. 
     In this liquid jet system, the position of the liquid absorbent material can be determined by the positioning part provided on the liquid container. 
     APPLICATION EXAMPLE 11 
     The above-described liquid jet system includes a second liquid absorbent material above the liquid container in the use orientation. 
     In this liquid jet system, the second liquid absorbent material is above the liquid container in the use orientation. Therefore, for example, in the case where the liquid container adopts an inverted orientation that is an orientation inverted from the use orientation, even if liquid leaks out from the open air port, the leaked liquid is easily caught by the second liquid absorbent material. As a result, in the inverted orientation, even if the liquid leaks out from the open air port, it is possible to suppress the possibility of soiling caused by the liquid leakage to a low level. 
     APPLICATION EXAMPLE 12 
     The above-described liquid jet system includes a second positioning part for determining a position of the second liquid absorbent material. 
     In this liquid jet system, the position of the second liquid absorbent material is easily determined by the second positioning part, and thus it is possible to prevent the position of the second liquid absorbent material from being easily displaced. 
     APPLICATION EXAMPLE 13 
     In the above-described liquid jet system, the second positioning part is provided on the liquid container. 
     In this liquid jet system, the position of the second liquid absorbent material can be determined by the second positioning part provided on the liquid container. 
     APPLICATION EXAMPLE 14 
     A liquid supply device supplying a liquid to a liquid jet head jetting the liquid includes a liquid container containing the liquid and a casing that covers the liquid container, wherein the liquid container includes a liquid containing portion containing the liquid, a liquid inlet portion receiving injection of injecting the liquid into the liquid containing portion, and an open air port that communicates with the liquid containing portion and is introducing atmospheric air into the liquid containing portion, and assuming that an orientation when the liquid container is being used is a use orientation of the liquid container, a liquid holding portion holding the liquid is provided in a portion of the casing that faces the liquid container vertically above the liquid container in the use orientation. 
     In this liquid supply device, for example, even if the liquid that leaked from the liquid container adheres to the casing, the adhered liquid can be held by the liquid holding portion. Accordingly, it is possible to suppress the possibility of soiling caused by the liquid leakage to a low level. 
     APPLICATION EXAMPLE 15 
     In the above-described liquid supply device, the liquid holding portion is constituted by a groove formed in the casing, a recessed portion formed in the casing, or a liquid absorbent material absorbing the liquid. 
     In this liquid supply device, the liquid can be held by the liquid holding portion constituted by the groove formed in the casing, the recessed portion formed in the casing, or the liquid absorbent material capable of absorbing the liquid. 
     APPLICATION EXAMPLE 16 
     In the above-described liquid supply device, a guiding path that guides the liquid to the liquid holding portion constituted by the liquid absorbent material is formed in the casing. 
     In this liquid supply device, liquid adhering to the casing is easily guided to the liquid holding portion by the guiding path formed in the casing. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The invention will be described with reference to the accompanying drawings, wherein like numbers reference like elements. 
         FIG. 1  is a perspective view showing a main configuration of a liquid jet system in an embodiment. 
         FIG. 2  is a perspective view showing the main configuration of the liquid jet system in the embodiment. 
         FIG. 3  is a perspective view showing a main configuration of another example of the liquid jet system in the embodiment. 
         FIG. 4  is an exploded perspective view showing a main configuration of an ink supply device in the embodiment. 
         FIG. 5  is a perspective view showing the main configuration of the ink supply device in the embodiment. 
         FIG. 6  is an exploded perspective view showing a tank in Example 1. 
         FIG. 7  is a perspective view showing the tank in Example 1. 
         FIG. 8  is a side view of the tank in Example 1 when viewed from a sheet member side. 
         FIG. 9  is a perspective view showing a tank in Example 2. 
         FIG. 10  is an exploded perspective view showing the tank in Example 2. 
         FIG. 11  is a perspective view showing a tank in Example 3. 
         FIG. 12  is a perspective view showing the tank in Example 3. 
         FIG. 13  is a perspective view showing a tank in Example 4. 
         FIG. 14  is an exploded perspective view showing the tank in Example 4. 
         FIG. 15  is an exploded perspective view showing a tank in Example 5. 
         FIG. 16  is an exploded perspective view showing the tank in Example 5. 
         FIG. 17  is a perspective view showing a tank in Example 6. 
         FIG. 18  is an exploded perspective view showing the tank in Example 6. 
         FIG. 19  is a perspective view showing a tank in Example 7 
         FIG. 20  is an exploded perspective view showing the tank in Example 7. 
         FIG. 21  is an exploded perspective view showing a tank in Example 8. 
         FIG. 22  is an exploded perspective view showing a main configuration of an ink supply device in Example 9. 
         FIG. 23  is a perspective view showing the main configuration of the ink supply device in Example 9. 
         FIG. 24  is an exploded perspective view showing a main configuration of Positioning Example 1. 
         FIG. 25  is an exploded perspective view showing a main configuration of Positioning Example 2. 
         FIG. 26  is an exploded perspective view showing a main configuration of an ink supply device in Example 10. 
         FIG. 27  is a perspective view showing the main configuration of the ink supply device in Example 10. 
         FIG. 28  is an exploded perspective view showing a main configuration of an ink supply device in Example 11. 
         FIG. 29  is a perspective view showing the main configuration of the ink supply device in Example 11. 
         FIG. 30  is an exploded perspective view showing a main configuration of Positioning Example 3. 
         FIG. 31  is a perspective view showing a main configuration of an ink supply device in Example 16. 
         FIG. 32  is a perspective view showing a main configuration of an ink supply device in Example 17. 
         FIG. 33  is a perspective view showing a main configuration of an ink supply device in Example 18. 
         FIG. 34  is a perspective view showing the main configuration of the ink supply device in Example 18. 
         FIG. 35  is an enlarged diagram of a portion A in  FIG. 34 . 
         FIG. 36  is a perspective view showing a main configuration of an ink supply device in Example 19. 
         FIG. 37  is a perspective view showing a main configuration of an ink supply device in Example 20. 
     
    
    
     DESCRIPTION OF EXEMPLARY EMBODIMENTS 
     Embodiments will be described with reference to the drawings, taking, as an example, a liquid jet system that includes an inkjet printer (hereinafter, referred to as a printer), which is an example of a liquid jet device. Note that in the drawings, some constituent elements and members are illustrated with a different scale so as to have a size that allows the configuration of respective constituent elements and members to be recognized. 
     A liquid jet system  1  in this embodiment has a printer  3 , which is an example of the liquid jet device, an ink supply device  4 A, which is an example of a liquid supply device, and a scanner unit  5 , as shown in  FIG. 1 . The printer  3  has a casing  6 . The casing  6  constitutes the outer shell of the printer  3 . The ink supply device  4 A has a casing  7 , which is an example of a liquid container mounting part, and a plurality of (two or more) tanks  9 . The casing  6 , the casing  7  and the scanner unit  5  constitute the outer shell of the liquid jet system  1 . The tank  9  is an example of a liquid container. The liquid jet system  1  can perform printing on a recording medium P such as recording paper using ink, which is an example of liquid. 
     Note that in  FIG. 1 , X, Y and Z axes that are coordinate axes orthogonal to one another are given. In the figures after  FIG. 1  as well, X, Y and Z axes are given as necessary. In this embodiment, a state in which the liquid jet system  1  is arranged in the horizontal plane (XY plane) that is defined by the X axis and the Y axis is a use state of the liquid jet system  1 . The orientation of the liquid jet system  1  when the liquid jet system  1  is arranged on the XY plane is referred to as a use orientation of the liquid jet system  1 . The Z axis is an axis orthogonal to the horizontal plane. In the use state of the liquid jet system  1 , a Z axis direction is a vertically upward direction. In addition, in the use state of the liquid jet system  1 , in  FIG. 1 , a −Z axis direction is a vertically downward direction. Note that regarding each of the X, Y and Z axes, the direction of the arrow indicates a +(positive) direction, and a direction opposite to the direction of the arrow indicates a −(negative) direction. 
     In the liquid jet system  1 , the printer  3  and the scanner unit  5  are stacked. In the state in which the printer  3  is used, the scanner unit  5  is positioned vertically above the printer  3 . The scanner unit  5  is of a flat bed type, and has an imaging element (not illustrated) such as an image sensor. The scanner unit  5  can read, as image data, an image recorded on a medium such as paper or the like via the imaging element. Therefore, the scanner unit  5  functions as a device for reading images or the like. The scanner unit  5  is constituted to be able to rotate with respect to the printer  3 . The scanner unit  5  also has a function as a lid of the printer  3 . An operator can rotate the scanner unit  5  with respect to the printer  3  by lifting the scanner unit  5  up in the Z axis direction. Accordingly, it is possible to expose the printer  3  using the scanner unit  5  that functions as the lid of the printer  3 . 
     The printer  3  is provided with a paper discharge part  11 . In the printer  3 , the recording medium P is discharged from the paper discharge part  11 . In the printer  3 , a surface on which the paper discharge part  11  is provided is assumed to be a front surface  13 . In addition, the liquid jet system  1  has an upper surface  15  intersecting the front surface  13  and a side portion  19  intersecting the front surface  13  and the upper surface  15 . The ink supply device  4 A is provided on the side portion  19 . The casing  7  is provided with windows  21 . The windows  21  are provided on a side portion  27  intersecting a front surface  23  and an upper surface  25  in the casing  7 . 
     The windows  21  have optical transparency. Four tanks  9  that are described above are provided at the positions at which the tanks  9  and the windows  21  overlap each other. Therefore, an operator that uses the liquid jet system  1  can visually recognize the four tanks  9  through the windows  21 . In this embodiment, the windows  21  are provided as an opening formed in the casing  7 . The operator can visually recognize the four tanks  9  via the windows  21 , which are the openings. Note that the windows  21  are not limited to an opening, and may be constituted by a member having optical transparency, for example. 
     In this embodiment, at least a portion of a region of each of the tanks  9  that faces the window  21  has optical transparency. Ink in the tanks  9  can be visually recognized through the site of each of the tanks  9  that has optical transparency. Therefore, the operator can visually recognize the amount of ink in each of the tanks  9  by viewing the four tanks  9  via the windows  21 . In other words, at least the portion of the site of each of the tanks  9  that faces the windows  21  can be used as a visual recognition portion that enables visual recognition of the amount of ink. 
     The printer  3  has a recorder  31  and a controller  32  as shown in  FIG. 2 . In the printer  3 , the recorder  31  and the controller  32  are housed in the casing  6 . The recorder  31  performs recording using ink, which is an example of liquid, on the recording medium P conveyed by a conveyance device (not illustrated) in the Y axis direction. Note that the conveyance device that is not illustrated intermittently conveys the recording medium P such as recording paper in the Y axis direction. The recorder  31  is constituted to be reciprocally movable along the X axis by a movement device (not illustrated). The ink supply device  4 A supplies the ink to the recorder  31 . The controller  32  controls the driving of each of the above-described constituent elements. Note that in the liquid jet system  1 , at least a portion of the ink supply device  4 A protrudes outside of the casing  6 . Note that the recorder  31  is housed in the casing  6 . Accordingly, the recorder  31  can be protected by the casing  6 . 
     Here, a direction along the X axis is not limited to the direction perfectly parallel to the X axis, and includes directions inclined due to error, tolerance or the like except for the direction orthogonal to the X axis. Similarly, a direction along the Y axis is not limited to the direction perfectly parallel to the Y axis, and includes directions inclined due to error, tolerance or the like except for the direction orthogonal to the Y axis. A direction along the Z axis is not limited to the direction perfectly parallel to the Z axis, and includes directions inclined due to error, tolerance or the like except for the direction orthogonal to the Z axis. In other words, directions along any axes or planes are not limited to directions perfectly parallel to these axes or planes, and include directions inclined due to error, tolerance or the like except for the directions orthogonal to these axes or planes. 
     The recorder  31  is provided with a carriage  33  and a recording head  34 . The recording head  34  is an example of a liquid jet head, and performs recording on the recording medium P by ejecting ink as ink droplets. The carriage  33  is equipped with the recording head  34 . Note that the recording head  34  is electrically connected to the controller  32 . Ejection of ink droplets from the recording head  34  is controlled by the controller  32 . 
     The ink supply device  4 A has a tank  9 , which is an example of the liquid container. In this embodiment, the ink supply device  4 A has a plurality of (in this embodiment, four) tanks  9 . The plurality of tanks  9  protrude outside the casing  6  of the printer  3 . The plurality of tanks  9  are housed inside the casing  7 . Accordingly, the tanks  9  can be protected by the casing  7 . The casing  7  protrudes from the casing  6 . 
     Note that in this embodiment, the ink supply device  4 A has a plurality of (four) tanks  9 . However, the number of the tanks  9  is not limited to four, and three or less tanks  9  and four or more tanks  9  can be adopted. 
     Furthermore, in this embodiment, the tanks  9  are constituted separately from one another. However, the configuration of the tanks  9 , which are examples of the liquid container, is not limited thereto. As the configuration of the liquid container, a configuration in which a plurality of tanks  9  are integrated and are used as one liquid container can be adopted. In this case, the one liquid container is provided with a plurality of liquid containing portions. The liquid containing portions are individually separated from one another, and are constituted to be able to contain different types of liquid. In this case, for example, the liquid containing portions can individually contain different colors of ink. 
     Ink, which is an example of a liquid, is stored in the tank  9 . A liquid inlet portion  35  is formed on the tank  9 . In the tank  9 , ink can be injected from outside of the tank  9  into the tank  9  via the liquid inlet portion  35 . Note that the operator can access the liquid inlet portion  35  of the tank  9  from outside of the casing  7 . In addition, the liquid inlet portion  35  is sealed by a cap (not illustrated). When injecting the ink into the tank  9 , the ink is injected after opening the liquid inlet portion  35  by opening the cap. 
     An ink supply tube  36  is connected to each of the tanks  9 . The ink supply tube  36  is an example of a supply tube. Ink in the tanks  9  is supplied from the ink supply device  4 A to the recording head  34  via the ink supply tubes  36 . The ink supplied to the recording head  34  is then ejected as ink droplets from a nozzle (not illustrated) directed to a recording medium P side. Note that the above-described example was described assuming that the printer  3  and the ink supply device  4 A have separate configurations, but the ink supply device  4 A can be included in the configuration of the printer  3 . 
     Note that as the tanks  9 , a configuration in which an upper limit mark  38 , a lower limit mark  39  and the like are added to a visual recognition surface  37  that enables visual recognition of the amount of ink stored in the tank  9  can also be adopted. The operator can recognize the amount of ink in the tank  9  using the upper limit mark  38  and the lower limit mark  39  as markers. Note that the upper limit mark  38  is an ink amount guide for preventing the ink from overflowing from the liquid inlet portion  35 , when injecting the ink from the liquid inlet portion  35 . Also, the lower limit mark  39  is an ink amount guide for prompting ink inlet. A configuration in which at least the upper limit mark  38  or the lower limit mark  39  is provided on the tank  9  can also be adopted. 
     In addition, the casing  7  and the casing  6  may be separated from each other or may be integrated. In the case where the casing  7  and the casing  6  are integrated, the tanks  9  can be housed in the casing  6  along with the recording head  34  and the ink supply tubes  36  as shown in  FIG. 3 . 
     In addition, a location in which the tanks  9  are arranged is not limited to the side face side in the X axis direction of the casing  6 . As the location in which the tanks  9  are arranged, for example, the front face side in the Y axis direction of the casing  6  as shown in  FIG. 3  can also be adopted. 
     In addition, in this embodiment, the tanks  9  are constituted separately from each other. However, the configuration of the tanks  9  is not limited thereto. As the configuration of the tanks  9 , a configuration in which the tanks  9  are integrated as shown in  FIG. 3  can also be adopted. In this case, a plurality of ink chambers are provided in one tank  9 . The ink chambers are individually separated from one another, and are constituted so as to be able to contain different types of ink. In this case, for example, the ink chambers can individually contain different colors of ink. 
     In the liquid jet system  1  having the above-described configuration, the recording medium P is conveyed in the Y axis direction and the carriage  33  is moved reciprocally along the X axis while ejecting ink droplets onto the recording head  34  at predetermined positions, and thereby recording is performed on the recording medium P. These operations are controlled by the controller  32 . 
     The ink is not limited to either water-based ink or oil-based ink. Moreover, as the water-based ink, either ink constituted by dissolving a solute such as a dye in a water-based solvent or ink constituted by dispersing a dispersoid such as pigment in a water-based dispersion medium may be used. Also, as the oil-based ink, either ink constituted by dissolving a solute such as a dye in an oil-based solvent or ink constituted by dispersing a dispersoid such as pigment in an oil-based dispersion medium may be used. 
     In the ink supply device  4 A, the casing  7  includes a first casing  41  and a second casing  42 , as shown in  FIG. 4 . 
     Here, an X axis, a Y axis and a Z axis in  FIG. 4  respectively correspond to the X axis, the Y axis and the Z axis for the liquid jet system  1  shown in  FIG. 1 . Specifically, the X axis, the Y axis and the Z axis in  FIG. 4  indicate the X axis, the Y axis and the Z axis in the state where the ink supply device  4 A is assembled in the liquid jet system  1 . In the case where, hereinafter, figures showing the constituent elements and units of the liquid jet system  1  are given an X axis, a Y axis and a Z axis, those axes also indicate the X axis, the Y axis and the Z axis in the state where the constituent elements and the units are assembled in (mounted to) the liquid jet system  1 . Moreover, the orientation of each of the constituent elements and units in the use orientation of the liquid jet system  1  is referred to as a use orientation of those constituent elements and units. 
     As shown in  FIG. 4 , the first casing  41  is positioned in the −Z axis direction relative to the tanks  9 . The tanks  9  are supported by the first casing  41 . The second casing  42  is positioned in the Z axis direction relative to the first casing  41 , and covers the tanks  9  from the Z axis direction of the first casing  41 . The tanks  9  are covered with the first casing  41  and the second casing  42 . 
     In this embodiment, the four tanks  9  are aligned along the Y axis. In the following description, in the case of individually distinguishing the four tanks  9 , the four tanks  9  are individually indicated as a tank  91 , a tank  92 , a tank  93  and a tank  94 . The tank  91 , the tank  92 , the tank  93  and the tank  94  are aligned in this order in the Y axis direction. Specifically, the tank  92  is positioned in the Y axis direction relative to the tank  91 , the tank  93  is positioned in the Y axis direction relative to the tank  92 , and the tank  94  is positioned in the Y axis direction relative to the tank  93 . 
     The tank  91 , the tank  92  and the tank  93  among the four tanks  9  have the same shape. The tank  94  has a shape different from that of the other tanks  9 . The volume of the tank  94  is larger than the volume of the other tanks  9 . Except for that point, the tank  94  has the same configuration as the other tanks  9 . This configuration is suitable for containing a type of ink that is frequently used in the tank  94 , for example. This is because the type of ink that is frequently used can be stored in a greater amount than the other types of ink. 
     The second casing  42  has a cover  43 . The cover  43  is constituted so as to be able to rotate with respect to the second casing  42  as shown in  FIG. 5 . In  FIG. 5 , the state in which the cover  43  is opened with respect to the second casing  42  is illustrated. When the cover  43  is opened with respect to the second casing  42 , the liquid inlet portions  35  of the tanks  9  are exposed. Accordingly, the operator can access the liquid inlet portions  35  of the tanks  9  from outside of the casing  7 . 
     Various examples of the tank  9  and the ink supply device  4 A will be described. Note that in the following description, for the purpose of distinguishing the tanks  9  and the ink supply device  4 A for each of the examples, an alphabetic character different for each of the examples is given to the reference signs of the tanks  9  and the ink supply device  4 A. Moreover, as described above, the tank  94  among the four tanks  9  and the other tanks  9  have the same configuration except that the volumes are different. The examples of the tanks  9  will be described below regarding the tank  91  as an example. The various examples of the tanks  9  can be applied to the tank  94 . Therefore, detailed description of the examples of the tank  94  is omitted. 
     EXAMPLE 1 
     A tank  9 A in Example 1 will be described. The tank  9 A has a case  51 , which is an example of a tank body, and a sheet member  52  as shown in  FIG. 6 . The case  51  is made of a synthetic resin such as nylon or polypropylene. Moreover, the sheet member  52  is formed into a film by synthetic resin (ex. nylon or polypropylene), and has flexibility. In this embodiment, the sheet member  52  has optical transparency. 
     The case  51  has a recessed portion  53  formed therein. The case  51  is also provided with a joining portion  54 . In  FIG. 6 , in order to show the configuration so as to be easily understood, the joining portion  54  is hatched. In this embodiment, the case  51  and the sheet member  52  are joined by welding. When the sheet member  52  is joined to the case  51 , the recessed portion  53  is blocked by the sheet member  52 . A space surrounded by the recessed portion  53  and the sheet member  52  is referred to as a liquid containing portion  55 . Ink is stored in the liquid containing portion  55 . 
     As shown in  FIG. 6 , the case  51  has a wall  61  and a side wall  62 . The wall  61  extends along the XZ plane. The side wall  62  intersect the wall  61 . The side wall  62  protrudes from the wall  61  in the −Y axis direction. When the wall  61  is viewed in a planar view in the Y axis direction, the side wall  62  surrounds the wall  61 . The wall  61  and the side wall  62  constitute the recessed portion  53  whose bottom is the wall  61 . Note that the wall  61  and the side wall  62  are not limited to flat walls, and may include recessed portions, steps and the like. 
     The recessed portion  53  is constituted in a direction so as to be recessed toward the Y axis direction. The recessed portion  53  is open in the −Y axis direction, that is, toward a sheet member  52  side. In other words, the recessed portion  53  is constituted in a direction so as to be recessed toward the Y axis direction, that is, on a side opposite to the sheet member  52  side. When the sheet member  52  is joined to the case  51 , the recessed portion  53  is blocked by the sheet member  52 , and the liquid containing portion  55  is formed. In other words, when the sheet member  52  is joined to the case  51 , the wall  61 , the side walls  62  and the sheet member  52  define the liquid containing portion  55 . Note that the liquid inlet portion  35  is positioned in the Z axis direction of the liquid containing portion  55 , and passes through the side wall  62  along the Z axis to the liquid containing portion  55 . 
     In addition, the tank  9 A has a liquid supply portion  64 , an atmospheric air open path  65  and an open air port  66  as shown in  FIG. 6 . The liquid supply portion  64  is a portion that serves as an outlet for ink stored in the liquid containing portion  55  when the ink is supplied from the liquid containing portion  55  to the recording head  34 . The ink stored in the liquid containing portion  55  is ejected to the outside of the tank  9 A via the liquid supply portion  64 . 
     The atmospheric air open path  65  communicates with the liquid containing portion  55  via a notch  67  formed in the side wall  62 . The liquid containing portion  55  is open to the atmospheric air at the open air port  66  from the notch  67  via the atmospheric air open path  65 . Therefore, the atmospheric air introduced from the open air port  66  to the atmospheric air open path  65  can flow into the liquid containing portion  55  through the atmospheric air open path  65 . Note that the notch  67  constitutes a portion of the atmospheric air open path  65 . In other words, the notch  67  is included in the atmospheric air open path  65 . In addition, the open air port  66  is an opening formed on the case  51 , and is defined as an opening that is open to the outside of the tank  9 A. 
     The atmospheric air introduced from the open air port  66  to the atmospheric air open path  65  flows into a first atmospheric air chamber  69  through an introduction portion  68  as shown in  FIG. 7 . Note that in  FIG. 7 , a state in which the tank  9 A is viewed from the sheet member  52  side is shown, and the case  51  viewed through the sheet member  52  is illustrated. Moreover, in  FIG. 7 , in order to show the configuration so as to be easily understood, the joining portion  54  is hatched. The first atmospheric air chamber  69  is positioned in the Z axis direction relative to the liquid containing portion  55 . 
     The first atmospheric air chamber  69  communicates with a first introduction path  72  via a communication port  71 . The communication port  71  is defined as an opening formed at an intersection at which the internal wall of the first atmospheric air chamber  69  intersects the first introduction path  72 . In other words, the communication port  71  is a location at which the first introduction path  72  is connected to the first atmospheric air chamber  69 . Note that a configuration in which tube holding portions  81  are provided on the tank  9  can also be adopted. In an example shown in  FIG. 7 , the tube holding portions  81  are formed on the case  51 . The tube holding portions  81  each have an annular appearance, and have a configuration in which a portion of the annular shape is cut away. The tube holding portions  81  are constituted such that the ink supply tubes  36  ( FIG. 3 ) connected to the introduction portions  68  can be inserted thereinto. The ink supply tubes  36  can be held by the tube holding portions  81 . With the tank  9  that is provided with the tube holding portions  81 , it is sufficient that the ink supply tubes  36  are inserted into the tube holding portions  81 , and thus the ink supply tubes  36  can be easily fixed during the assembly. 
     The first introduction path  72  extends around outside the first atmospheric air chamber  69 , in the state where the tank  9 A is viewed in a planar view in the Y axis direction, as shown in  FIG. 8 . The first introduction path  72  extends around outside the first atmospheric air chamber  69  and extends along the peripheral edge of the case  51 , and leads to a second atmospheric air chamber  73  via a route that turns back and meanders. 
     The second atmospheric air chamber  73  is positioned in the −X axis direction relative to the first atmospheric air chamber  69 . The second atmospheric air chamber  73  leads to a third atmospheric air chamber  75  via a communication path  74 . The third atmospheric air chamber  75  is positioned in the −Z axis direction relative to the first atmospheric air chamber  69 , and is positioned in the X axis direction relative to the second atmospheric air chamber  73 . The third atmospheric air chamber  75  is positioned along the Z axis between the first atmospheric air chamber  69  and the liquid containing portion  55 . The third atmospheric air chamber  75  leads to a fourth atmospheric air chamber  77  via a communication path  76 . The fourth atmospheric air chamber  77  is positioned in the X axis direction relative to the third atmospheric air chamber  75 . The fourth atmospheric air chamber  77  leads to a communication path  78 . The communication path  78  is an area surrounded by the notch  67  formed on the case  51  and the sheet member  52 . 
     The communication path  78  communicates with the liquid containing portion  55  via a communication port  79 . The communication port  79  is defined as an opening formed at an intersection at which the internal wall of the liquid containing portion  55  intersects the communication path  78 . In other words, the communication port  79  is a location in which the communication path  78  is connected to the liquid containing portion  55 . According to the above configuration, the atmospheric air open path  65  includes the introduction portion  68  shown in  FIG. 7 , the first atmospheric air chamber  69 , the first introduction path  72 , the second atmospheric air chamber  73 , the communication path  74 , the third atmospheric air chamber  75 , the communication path  76 , the fourth atmospheric air chamber  77 , and the communication path  78 . In addition, one end of the atmospheric air open path  65  is the open air port  66 , and the other end of the atmospheric air open path  65  is the communication port  79 . 
     Note that the configuration of the atmospheric air open path  65  is not limited thereto, and configurations in which the combination and order of various atmospheric air chambers, introduction paths, communication paths and the like are arbitrarily changed can also be adopted. Furthermore, configurations in which a portion of various atmospheric air chambers, introduction paths or communication paths is omitted or added can also be adopted. Furthermore, in addition to such configurations, a configuration in which the introduction portion  68  is omitted can also be adopted. In the configuration in which the introduction portion  68  is omitted, the open air port  66  is defined as an opening that is opened in the outer wall of the case  51 . 
     Ink in the liquid containing portion  55  is supplied to the recording head  34  along with printing performed by the recording head  34 . At this time, the pressure in the liquid containing portion  55  decreases below the atmospheric air pressure along with the printing performed by the recording head  34 . When the pressure in the liquid containing portion  55  decreases below the atmospheric air pressure, the ink in the liquid containing portion  55  is prevented from being easily supplied to the recording head  34 . When this occurs, the ability of the recording head  34  to eject the ink tends to deteriorate, and thus recording quality deteriorates in some cases. To deal with this, in the tank  9 A, the liquid containing portion  55  is open to the atmospheric air via the atmospheric air open path  65 , and thus the pressure in the liquid containing portion  55  is easily maintained at the atmospheric air pressure. Therefore, in the liquid jet system  1  in this embodiment, it is easy to maintain high recording quality. 
     EXAMPLE 2 
     A tank  9 B of Example 2 has a liquid absorbent material  101  as shown in  FIG. 9 . The tank  9 B of Example 2 has a configuration in which the liquid absorbent material  101  is added to the tank  9 A of Example 1 as shown in  FIG. 10 . Except for that point, the tank  9 B of Example 2 has the same configuration as the tank  9 A of Example 1. Therefore, in the following description, the same reference signs as Example 1 are given to the same constituent elements as Example 1, and detailed description thereof is omitted. 
     The liquid absorbent material  101  has a property of absorbing liquid and holding the absorbed liquid. As the material of the liquid absorbent material  101 , various materials such as foam, felt and a nonwoven fabric can be adopted. A through hole  102  is formed on the liquid absorbent material  101 . Due to the through hole  102 , the liquid absorbent material  101  has an annular appearance when viewed in a planar view in the X axis direction. As shown in  FIG. 9 , the liquid absorbent material  101  is arranged on the case  51  such that the open air port  66  is positioned inside the through hole  102 . Therefore, the liquid absorbent material  101  is arranged around the open air port  66 . 
     Note that in the tank  9 B, the liquid absorbent material  101  is joined to the case  51 . Various joining methods of the joining of the liquid absorbent material  101  to the case  51  can be adopted, such as bonding, welding and attachment using an adhesive tape. 
     With the tank  9 B of Example 2, the liquid absorbent material  101  is arranged around the open air port  66 , and thus even if ink leaks out from the open air port  66 , the leaked ink can be absorbed by the liquid absorbent material  101 . Accordingly, the possibility of soiling caused by the ink leakage can be suppressed to a low level. Note that in Example 2, an example in which the liquid absorbent material  101  is constituted by one member is described. However, the configuration of the liquid absorbent material  101  is not limited thereto. As the configuration of the liquid absorbent material  101 , a configuration in which two members are in contact with each other, a configuration in which three or more members are in contact with one another and the like can be adopted. With such configurations, a similar effect is obtained. 
     EXAMPLE 3 
     In the tank  9 B of Example 2, the liquid absorbent material  101  is provided over the entire periphery of the open air port  66 . However, the configuration of the tank  9  is not limited thereto. As the configuration of the tank  9 , a configuration in which the liquid absorbent material  101  is arranged only in a portion of the periphery of the open air port  66  can also be adopted. A configuration in which the liquid absorbent material  101  is arranged only in a portion of the periphery of the open air port  66  will be described as a tank  9 C of Example 3. 
     The tank  9 C of Example 3 has a liquid absorbent material  103  as shown in  FIG. 11 . In the tank  9 C of Example 3, the liquid absorbent material  101  of the tank  9 B of Example 2 ( FIG. 9 ) is replaced by the liquid absorbent material  103 . Except for that point, the tank  9 C of Example 3 has the same configuration as the tank  9 B of Example 2. Therefore, in the following description, the same reference signs as Example 1 and Example 2 are given to the same constituent elements as Example 1 and Example 2, and detailed description thereof is omitted. 
     The liquid absorbent material  103  has a configuration in which an opening portion  104  is formed on the liquid absorbent material  101  in Example 2. The liquid absorbent material  103  has a shape in which the annular shape of the liquid absorbent material  101  having an annular shape with the through hole  102  shown in  FIG. 9  is partially open. Except for that point, the liquid absorbent material  103  has the same configuration as the liquid absorbent material  101 . Therefore, in the following description, the same reference signs as Example 2 are given to the same constituent elements as Example 2, and detailed description thereof is omitted. 
     In Example 3, as shown in  FIG. 12 , with the opening portion  104 , a configuration in which the liquid absorbent material  103  is arranged only in a portion of the periphery of the open air port  66  is provided. With a configuration in which the liquid absorbent material is arranged only in a portion of the periphery of the open air port  66  such as Example 3 in which the liquid absorbent material  103  is adopted, an effect of reducing soiling caused by ink that has leaked out from the open air port  66  is obtained. In other words, in Example 3 as well, the same effect as Example 2 is obtained. Therefore, with any configuration in which a liquid absorbent material is arranged at least in a portion of the periphery of the open air port  66 , soiling caused by the ink that has leaked from the open air port  66  can be reduced. Note that the position of the opening portion  104  is not limited to the position illustrated in  FIG. 12 , and any position in the annular shape can be adopted. 
     EXAMPLE 4 
     A tank  9 D of Example 4 has a liquid absorbent material  105  as shown in  FIG. 13 . The tank  9 D of Example 4 has a configuration in which the liquid absorbent material  105  is added to the tank  9 B of Example 2 as shown in  FIG. 14 . Except for that point, the tank  9 D of Example 4 has the same configuration as the tank  9 B of Example 2. Therefore, in the following description, the same reference signs as Example 1 or Example 2 are given to the same constituent elements as Example 1 or Example 2, and detailed description thereof is omitted. 
     The liquid absorbent material  105  has a property of absorbing liquid and holding the absorbed liquid. As the material of the liquid absorbent material  105 , the same material as the liquid absorbent material  101  can be adopted. The liquid absorbent material  105  is arranged at a position facing the open air port  66 . As shown in  FIG. 13 , the liquid absorbent material  105  is joined to the liquid absorbent material  101  in the state of blocking the through hole  102  of the liquid absorbent material  101  ( FIG. 14 ). Therefore, the open air port  66  ( FIG. 14 ) is covered with the liquid absorbent material  101  and the liquid absorbent material  105 . As the joining of the liquid absorbent material  105  to the liquid absorbent material  101 , various joining methods such as bonding, welding or attachment using an adhesive tape can be adopted. Note that in Example 4, the liquid absorbent material  101  is an example of a first portion, and the liquid absorbent material  105  is an example of a second portion. In Example 4 as well, the same effect as Example 2 and Example 3 is obtained. 
     Furthermore, with the tank  9 D of Example 4, due to the liquid absorbent material  101  positioned at the periphery of the open air port  66  and the liquid absorbent material  105  facing the open air port  66 , ink leaking out to the periphery of the open air port  66  and in a direction facing the open air port is easily absorbed by the liquid absorbent material  101  and the liquid absorbent material  105 . In other words, in the tank  9 D of Example 4, the liquid absorbent material  101  and the liquid absorbent material  105  covers the open air port  66 , and therefore even if the ink leaks out from the open air port  66 , it is easy for the liquid absorbent material  101  and the liquid absorbent material  105  to reliably absorb the leaked ink. Accordingly, the possibility of soiling caused by the ink leakage can be further suppressed to a low level. 
     Note that in the tank  9 D of Example 4, the liquid absorbent material  101  and the liquid absorbent material  105  are constituted separately from each other. However, the configuration of the tank  9 D is not limited thereto. As the configuration of the tank  9 D, a configuration in which the liquid absorbent material  101  and the liquid absorbent material  105  are formed integrally with each other can also be adopted. In addition, in Example 4 as well, a configuration in which the liquid absorbent material  101  is arranged only in a portion of the periphery of the open air port  66  similarly to the liquid absorbent material  103  of Example 3 can also be adopted. With the configuration in which the liquid absorbent material  101  is arranged only in a portion of the periphery of the open air port  66  as well, an effect of reducing soiling caused by ink that has leaked from the open air port  66  is obtained. 
     EXAMPLE 5 
     A tank  9 E of Example 5 has the liquid absorbent material  103  and the liquid absorbent material  105  as shown in  FIG. 15 . In the tank  9 E of Example 5, the liquid absorbent material  101  of the tank  9 D of Example 4 ( FIG. 14 ) is replaced by the liquid absorbent material  103  of Example 2. Except for that point, the tank  9 E of Example 5 has the same configuration as the tank  9 D of Example 4. From another viewpoint, the tank  9 E of Example 5 has a configuration in which the liquid absorbent material  105  in the tank  9 D of Example 4 is added to the tank  9 C of Example 3 ( FIG. 11 ). Therefore, in the following description, the same reference signs as Example 1 to Example 4 are given to the same constituent elements as Example 1 to Example 4, and detailed description thereof is omitted. 
     In Example 5, as shown in  FIG. 16 , the opening portion  104  formed on the liquid absorbent material  103  is open to the atmospheric air. Therefore, in Example 5, the open air port  66  is easily opened to the atmospheric air via the opening portion  104  formed on the liquid absorbent material  103 . In Example 5 as well, the same effect as Example 2 to Example 4 is obtained. Note that the opening portion  104  has a shape formed by cutting away a portion of the annular shape of the liquid absorbent material  101  shown in  FIG. 9 . Therefore, the opening portion  104  can be regarded as a notch portion formed by cutting away a portion of the annular shape of the liquid absorbent material  101  shown in  FIG. 9 . 
     Moreover, in Example 5, as shown in  FIG. 16 , the opening portion  104  is positioned vertically below the open air port  66 , in other words, the opening portion  104  is positioned in the −Z axis direction relative to the open air port  66 . Therefore, for example, in the case where the tank  9  adopts an inverted orientation that is inverted from the use orientation, the opening portion  104  of the liquid absorbent material  103  is positioned vertically above the open air port  66 . Accordingly, in the inverted orientation, even if ink leaks out from the open air port  66 , the leaked ink does not easily reach the opening portion  104  of the liquid absorbent material  103 . As a result, in the inverted orientation, even if ink leaks out from the open air port  66 , the possibility of soiling caused by the ink leakage can be suppressed to a low level. 
     Note that in the use orientation of the tank  9 , as shown in  FIG. 7 , the open air port  66  is positioned in the Z axis direction relative to the liquid containing portion  55 . In other words, in the use orientation of the tank  9 , the open air port  66  is positioned vertically above the liquid containing portion  55 . In contrast, in the inverted orientation of the tank  9 , the orientation of the tank  9  is inverted from the use orientation, and the open air port  66  is positioned in the −Z axis direction relative to the liquid containing portion  55 . In other words, in the inverted orientation of the tank  9 , the orientation of the tank  9  is inverted from the use orientation, and the open air port  66  is positioned vertically below the liquid containing portion  55 . The inverted orientation is a state in which the Z axis direction is a vertically downward direction. The state in which the Z axis direction is the vertically downward direction is not limited to the state in which the Z axis is perfectly parallel to the vertical line. The state in which the Z axis direction is the vertically downward direction includes the state in which the Z axis is inclined with respect to the vertical line except for the state in which the Z axis is parallel to the horizontal direction. 
     Moreover, in Example 5, the liquid absorbent material  103  is an example of the first portion, and the liquid absorbent material  105  is an example of the second portion. In the tank  9 E of Example 5, the liquid absorbent material  103  and the liquid absorbent material  105  are constituted separately from each other. However, the configuration of the tank  9 E is not limited thereto. As the configuration of the tank  9 E, a configuration in which the liquid absorbent material  103  and the liquid absorbent material  105  are constituted integrally with each other can also be adopted. 
     EXAMPLE 6 
     A tank  9 F of Example 6 has a positioning member  107  and a coupling portion  108  as shown in  FIG. 17 . The tank  9 F of Example 6 has a configuration in which the positioning member  107  and the coupling portion  108  are added to one of the tanks  9  of Example 2 to Example 5. Except for that point, the tank  9 F of Example 6 has the same configuration as the tanks  9  of Example 2 to Example 5. Therefore, in the following description, the same reference signs as Example 2 to Example 5 are given to the same constituent elements as Example 2 to Example 5, and detailed description thereof is omitted. 
     The positioning member  107  is formed to have a hollow shape as shown in  FIG. 18 , and is constituted so as to be able to house the liquid absorbent material  101  and the liquid absorbent material  105 . The coupling portion  108  is a portion to which the positioning member  107  is coupled, and is provided on the case  51 . Note that as a mode in which the coupling portion  108  is arranged on the case  51 , a mode in which the coupling portion  108  is joined to the case  51 , a mode in which the coupling portion  108  is formed integrally with the case  51  and the like can be adopted. Furthermore, as a joining method in the case of the mode in which the coupling portion  108  is joined to the case  51 , various methods such as bonding, welding, fitting, and screwing can be adopted. 
     In the state of covering the liquid absorbent material  101  and the liquid absorbent material  105 , the positioning member  107  is coupled to the coupling portion  108  using a screw  109  or the like. Note that the coupling between the positioning member  107  and the coupling portion  108  is not limited to coupling using the screw  109 . As a mode in which the positioning member  107  and the coupling portion  108  are coupled, for example, a mode in which the positioning member  107  is joined to the coupling portion  108  can also be adopted. As a joining method in this case, various methods such as bonding, welding and fitting can be adopted. In Example 6 as well, the same effect as Example 2 to Example 5 is obtained. 
     Furthermore, in Example 6, the position of the liquid absorbent material  101  and the position of the liquid absorbent material  105  with respect to the case  51  can be determined by the positioning member  107 . Moreover, in the tank  9 F of Example 6, the liquid absorbent material  101  and the liquid absorbent material  105  can be held by the positioning member  107 . Therefore, joining of the liquid absorbent material  101  to the case  51 , joining of the liquid absorbent material  105  to the liquid absorbent material  101  and the like can be omitted. In addition, in the tank  9 F of Example 6, the liquid absorbent material  101  and the liquid absorbent material  105  can be housed in the positioning member  107 . Therefore, the liquid absorbent material  101  and the liquid absorbent material  105  can be protected by the positioning member  107 . 
     Note that the tank  9 F of Example 6 is applicable to each of the tanks  9  of Example 2 to Example 5. For example, in the case where the tank  9 F of Example 6 is applied to the tank  9  of Example 2, the position of the liquid absorbent material  101  can be determined by the positioning member  107 , and the liquid absorbent material  101  can be held by the positioning member  107 . The tank  9 F of Example 6 can be similarly applied to each of the tanks  9  of Example 3 to Example 5. 
     EXAMPLE 7 
     A tank  9 G of Example 7 has an absorbent material housing part  111  as shown in  FIG. 19 . The tank  9 G of Example 7 has a configuration in which the absorbent material housing part  111  is added to any of the tanks  9  of Example 2 to Example 5. Except for that point, the tank  9 G of Example 7 has the same configuration as the tanks  9  of Example 2 to Example 5. Therefore, in the following description, the same reference signs as Example 2 to Example 5 are added to the same constituent elements as Example 2 to Example 5, and detailed description thereof is omitted. 
     The absorbent material housing part  111  is formed to have a hollow shape as shown in  FIG. 20 , and is constituted so as to be able to house the liquid absorbent material  101  and the liquid absorbent material  105 . Note that as a mode in which the absorbent material housing part  111  is arranged on the case  51 , a mode in which the absorbent material housing part  111  is joined to the case  51 , a mode in which the absorbent material housing part  111  is formed integrally with the case  51  and the like can be adopted. Furthermore, as a joining method in the case of the mode in which the absorbent material housing part  111  is joined to the case  51 , various methods such as bonding, welding, fitting and screwing can be adopted. In Example 7 as well, the same effect as Example 2 to Example 5 is obtained. 
     Furthermore, in Example 7, the position of the liquid absorbent material  101  and the position of the liquid absorbent material  105  with respect to the case  51  can be determined using the absorbent material housing part  111 . In addition, in the tank  9 G of Example 7, the liquid absorbent material  101  and the liquid absorbent material  105  can be held by the absorbent material housing part  111 . Therefore, joining of the liquid absorbent material  101  to the case  51 , joining of the liquid absorbent material  105  to the liquid absorbent material  101  and the like can be omitted. Moreover, in the tank  9 G of Example 7, the liquid absorbent material  101  and the liquid absorbent material  105  can be housed in the absorbent material housing part  111 . Therefore, the liquid absorbent material  101  and the liquid absorbent material  105  can be protected by the absorbent material housing part  111 . 
     Note that the tank  9 G of Example 7 is applicable to each of the tanks  9  of Example 2 to Example 5. For example, in the case where the tank  9 G of Example 7 is applied to the tank  9  of Example 2, the position of the liquid absorbent material  101  can be determined using the absorbent material housing part  111 , and the liquid absorbent material  101  can be held by the absorbent material housing part  111 . The tank  9 G of Example 7 can be similarly applied to each of the tanks  9  of Example 3 to Example 5. 
     EXAMPLE 8 
     A tank  9 H of Example 8 has the absorbent material housing part  111 , the liquid absorbent material  103  and a liquid absorbent material  112  as shown in  FIG. 21 . The tank  9 H of Example 8 has a configuration in which the absorbent material housing part  111  and the liquid absorbent material  112  are added to the tank  9 C of Example 3 ( FIG. 11 ). Except for that point, the tank  9 H of Example 8 has the same configuration as the tank  9 C of Example 3. Therefore, in the following description, the same reference signs as Example 1 to Example 3 are given to the same constituent elements as Example 1 to Example 3, and detailed description thereof is omitted. Also, the absorbent material housing part  111  has the same configuration as Example 7. Therefore, detailed description of the absorbent material housing part  111  is omitted. In Example 8 as well, the same effect as Example 7 is obtained. 
     A notch portion  113  is formed on the liquid absorbent material  112 . The liquid absorbent material  112  has a configuration in which the notch portion  113  is formed on the liquid absorbent material  105  ( FIG. 14 ). In other words, except that the notch portion  113  is formed, the liquid absorbent material  112  has the same configuration as the liquid absorbent material  105 . In the state where the tank  9 H is viewed in a planar view in the X axis direction, the notch portion  113  of the liquid absorbent material  112  is formed in an area overlapping at least a portion of the opening portion  104  of the liquid absorbent material  103 . Accordingly, when the tank  9 H is viewed in a planar view in the X axis direction, at least a portion of the opening portion  104  of the liquid absorbent material  103  is open to the atmospheric air via the notch portion  113  of the liquid absorbent material  112 . Therefore, in Example 8, the open air port  66  is easily opened to the atmospheric air via the opening portion  104  of the liquid absorbent material  103  and the notch portion  113  of the liquid absorbent material  112 . 
     EXAMPLE 9 
     An ink supply device  4 B of Example 9 has a liquid absorbent material  121  as shown in  FIG. 22 . The ink supply device  4 B of Example 9 has a configuration in which the liquid absorbent material  121  is added to the ink supply device  4 A ( FIG. 4 ). Except for that point, the ink supply device  4 B of Example 9 has the same configuration as the ink supply device  4 A. Therefore, in the following description, the same reference signs as the ink supply device  4 A are given to the same constituent elements as the ink supply device  4 A, and detailed description thereof is omitted. 
     The liquid absorbent material  121  is housed in the casing  7  along with the tanks  9 . The liquid absorbent material  121  has a property of absorbing liquid and holding the absorbed liquid. As the material of the liquid absorbent material  121 , various materials such as foam, felt and a nonwoven fabric can be adopted. Within the casing  7 , the liquid absorbent material  121  is positioned between the tank  94  among the tanks  9  and the second casing  42 . Therefore, the liquid absorbent material  121  is positioned in the Y axis direction relative to the tanks  9 . 
     When the ink supply device  4 B is viewed in the −Y axis direction, the liquid absorbent material  121  has a size so as to be within an area overlapping the tank  94 . Therefore, when the ink supply device  4 B is viewed in the −Y axis direction, the liquid absorbent material  121  does not project from the area overlapping the tank  94 . In the ink supply device  4 B, the liquid absorbent material  121  is arranged between the casing  7  and a side portion  122  of the tank  94 . In this example, the side portion  122  is a surface of the tank  94  that faces in the Y axis direction. The liquid absorbent material  121  having the above-described configuration is housed in the casing  7  so as to come in contact with the side portion  122  of the tank  94 , or be able to absorb ink that has leaked from the open air port  66  of the tank  94  even if the liquid absorbent material  121  does not come in contact with the side portion  122 , when the ink supply device  4 B falls over or is inclined such that the casing  7  on the side on which the liquid absorbent material  121  is arranged (a portion of the casing  7  that faces the side portion  122 ) is placed downward. 
     In the casing  7 , the liquid absorbent material  121  is positioned over the range of height from the first casing  41  to the open air port  66  of the tank  94  as shown in  FIG. 23 . In the ink supply device  4 B, in the use orientation of the tank  9 , the liquid absorbent material  121  is positioned at the height of the open air port  66 . Therefore, even if ink leaks out from the open air port  66 , the leaked ink is easily absorbed by the liquid absorbent material  121 . Accordingly, the possibility of soiling caused by the ink leakage can be suppressed to a low level. 
     Note that from the viewpoint of absorbing the ink that has leaked from the open air port  66  using the liquid absorbent material  121 , it is sufficient that the liquid absorbent material  121  is positioned at least at the height of the open air port  66 . Therefore, the liquid absorbent material  121  does not need to be arranged over the range of height from the first casing  41  to the open air port  66  of the tank  94 . For example, with a configuration in which the liquid absorbent material  121  is arranged only in the area overlapping the open air port  66  of the tank  94  in the state in which the ink supply device  4 B is viewed in the −Y axis direction as well, the possibility of soiling caused by the ink leakage can be reduced. 
     In addition, the above-described tube holding portion  81  may be provided for all of the tanks  9 , or may be provided for at least one of the tanks  9 . In an ink supply device  4  having the tanks  9  provided with the tube holding portion  81 , it is sufficient that the ink supply tubes  36  ( FIG. 3 ) are inserted into the tube holding portions  81 , and thus the ink supply tubes  36  can be easily fixed during assembly. 
     In the ink supply device  4 B, if the position of the liquid absorbent material  121  is fixed with respect to the tank  94 , displacement of the position of the liquid absorbent material  121  with respect to the open air port  66  of the tank  94  can be suppressed to a low level. Therefore, it is preferred to fix the position of the liquid absorbent material  121  with respect to the tank  94 . As a method for fixing the position of the liquid absorbent material  121  with respect to the tank  94 , a method for joining the liquid absorbent material  121  to the tank  94 , a method for joining the liquid absorbent material  121  to the casing  7 , or a method for joining the liquid absorbent material  121  to both the tank  94  and the casing  7  can be adopted. As a joining method in these cases, various joining methods such as bonding, welding and attachment using an adhesive tape can be adopted. Also, as a method for positioning the liquid absorbent material  121  between the tank  94  and the casing  7 , a method for press-fitting the liquid absorbent material  121  between the tank  94  and the casing  7  can also be adopted. Examples of the method for positioning the liquid absorbent material  121  between the casing  7  and the tank  94  (hereinafter, referred to as a positioning examples) will be described below. 
     POSITIONING EXAMPLE 1 
     In Positioning Example 1, the first casing  41  has a positioning part  124  as shown in  FIG. 24 . The positioning part  124  is provided at the bottom of the first casing  41 , and protrudes from the first casing  41  in the Z axis direction. The positioning part  124  is positioned in the Y axis direction relative to the side portion  122  of the tank  94 . If the first casing  41  and the second casing  42  ( FIG. 22 ) are combined, the positioning part  124  is hidden within the casing  7 . Therefore, the positioning part  124  is positioned between the tank  94  and the casing  7 . 
     As shown in  FIG. 24 , in Positioning Example 1, a slit  125  is formed in the liquid absorbent material  121 . The positioning part  124  and the slit  125  are constituted so as to be able to be fitted with each other. The liquid absorbent material  121  is fitted with the positioning part  124  by inserting the positioning part  124  into the slit  125  in the Z axis direction. Accordingly, a position of the liquid absorbent material  121  with respect to the tank  94  can be determined. The ink supply device  4 B in which the configuration of Positioning Example 1 is adopted is an example of a liquid supply device having the positioning part  124 . 
     Note that the function of the positioning part  124  of Positioning Example 1 is not limited to the function of determining the position of the liquid absorbent material  121 . The positioning part  124  may also have a positioning function of determining a position between the first casing  41  and the second casing  42  when combining the first casing  41  and the second casing  42  ( FIG. 22 ), and the like. In addition, the positioning part  124  may also have a coupling function for coupling the first casing  41  and the second casing  42  ( FIG. 22 ), and the like. 
     Moreover, in Positioning Example 1, the positioning part  124  is provided on the first casing  41 . However, the location in which the positioning part  124  is provided is not limited to the first casing  41 , and the second casing  42  can also be adopted. Furthermore, a configuration in which both the first casing  41  and the second casing  42  are provided with the positioning part  124  can also be adopted. 
     POSITIONING EXAMPLE 2 
     In Positioning Example 2, as shown in  FIG. 25 , the tank  94  has positioning parts  126 . In an example shown in  FIG. 25 , the tank  94  has two positioning parts  126 . However, the number of the positioning parts  126  is not limited thereto, and one positioning part or three or more positioning parts can also be adopted. The positioning parts  126  are provided on the side portion  122  of the tank  94 , and protrude from the side portion  122  in the Y axis direction. When combining the first casing  41  and the second casing  42  ( FIG. 22 ), the positioning parts  126  are hidden within the casing  7 . Therefore, the positioning parts  126  are positioned between the tank  94  and the casing  7 . 
     As shown in  FIG. 25 , in Positioning Example 2, fitting holes  127  are formed in the liquid absorbent material  121 . In this example, two fitting holes  127  are formed in the liquid absorbent material  121  in correspondence with the number of the positioning parts  126 . The number of the fitting holes  127  can be increased or decreased in accordance with the number of the positioning parts  126 . The positioning parts  126  and the fitting holes  127  are constituted so as to be able to be fitted with each other. The liquid absorbent material  121  is fitted with the positioning parts  126  by inserting the positioning parts  126  into the fitting hole  127  in the Y axis direction. Accordingly, a position of the liquid absorbent material  121  with respect to the tank  94  can be determined. The ink supply device  4 B in which the configuration of Positioning Example 2 is adopted is an example of a liquid supply device having the positioning parts  126 . 
     Note that in Positioning Example 2, the positioning parts  126  are provided on the tank  94 . However, a location in which the positioning parts  126  are provided is not limited to the tank  94 , and the second casing  42  can also be adopted. Furthermore, a configuration in which the positioning parts  126  are provided on both the tank  94  and the second casing  42  can also be adopted. 
     EXAMPLE 10 
     An ink supply device  4 C of Example 10 has a liquid absorbent material  131  as shown in  FIG. 26 . The ink supply device  4 C of Example 10 has a configuration in which the liquid absorbent material  131  is added to the ink supply device  4 A ( FIG. 4 ). Except for that point, the ink supply device  4 C of Example 10 has the same configuration as the ink supply device  4 A. Therefore, in the following description, the same reference signs as the ink supply device  4 A are given to the same constituent elements as the ink supply device  4 A, and detailed description thereof is omitted. 
     The liquid absorbent material  131  is housed in the casing  7  along with the tanks  9 . The liquid absorbent material  131  has a property of absorbing liquid and holding the absorbed liquid. As the material of the liquid absorbent material  131 , various materials such as foam, felt and a nonwoven fabric can be adopted. The liquid absorbent material  131  is positioned between the tank  91  among the tanks  9  and the second casing  42 , in the casing  7 . Therefore, the liquid absorbent material  131  is positioned in the −Y axis direction relative to the tanks  9 . 
     When the ink supply device  4 C is viewed in the Y axis direction, the liquid absorbent material  131  has a size so as to be within an area overlapping the tank  91 . Therefore, when the ink supply device  4 C is viewed in the Y axis direction, the liquid absorbent material  131  is not projected from the area overlapping the tank  91 . In the ink supply device  4 C, the liquid absorbent material  131  is in contact with a side portion of the tank  91 . In this example, the side portion of the tank  91  is a surface of the tank  91  that faces in the −Y axis direction. The liquid absorbent material  131  having the above-described configuration is housed in the casing  7  in the state of being in contact with the side portion of the tank  91 . 
     Within the casing  7 , the liquid absorbent material  131  is positioned over the range of height from the first casing  41  to the open air port  66  of the tank  91  as shown in  FIG. 27 . In the ink supply device  4 C, in the use orientation of the tanks  9 , the liquid absorbent material  131  is in contact with the side portion of the tank  91 , and is positioned at the height of the open air port  66 . Therefore, even if ink leaks out from the open air port  66 , the leaked ink is easily absorbed by the liquid absorbent material  131 . Accordingly, the possibility of soiling caused by the ink leakage can be suppressed to a low level. 
     Note that from the viewpoint of absorbing the ink that has leaked from the open air port  66  using the liquid absorbent material  131 , it is sufficient that the liquid absorbent material  131  is positioned at least at the height of the open air port  66 . Therefore, the liquid absorbent material  131  does not need to be arranged over the range of height from the first casing  41  to the open air port  66  of the tank  91 . For example, with a configuration in which the liquid absorbent material  131  is arranged only in an area overlapping the open air port  66  of the tank  91  in the state where the ink supply device  4 C is viewed in the Y axis direction as well, the possibility of soiling caused by the ink leakage can be reduced. 
     In the ink supply device  4 C, if the position of the liquid absorbent material  131  with respect to the tank  91  is fixed, displacement of the position of the liquid absorbent material  131  with respect to the open air port  66  of the tank  91  can be suppressed to a low level. Therefore, it is preferred to fix the position of the liquid absorbent material  131  with respect to the tank  91 . As a method for fixing the position of the liquid absorbent material  131  with respect to the tank  91 , a method similar to the method for fixing the position of the liquid absorbent material  121  with respect to the tank  94  in Example 9 can be applied, and thus detailed description thereof is omitted. In addition, as a positioning method for determining the position of the liquid absorbent material  131  with respect to the tank  91 , Positioning Example 1 and Positioning Example 2 can be applied, and thus detailed description thereof is omitted. 
     EXAMPLE 11 
     An ink supply device  4 D of Example 11 has a liquid absorbent material  132  as shown in  FIG. 28 . The ink supply device  4 D of Example 11 has a configuration in which the liquid absorbent material  132  is added to the ink supply device  4 A ( FIG. 4 ). Except for that point, the ink supply device  4 D of Example 11 has the same configuration as the ink supply device  4 A. Therefore, in the following description, the same reference signs as the ink supply device  4 A are given to the same constituent elements as the ink supply device  4 A, and detailed description thereof is omitted. 
     The liquid absorbent material  132  is housed in the casing  7  along with the tanks  9 . The liquid absorbent material  132  has a property of absorbing liquid and holding the absorbed liquid. The liquid absorbent material  132  is an example of a second liquid absorbent material. As the material of the liquid absorbent material  132 , various materials such as foam, felt and a nonwoven fabric can be adopted. Within the casing  7 , the liquid absorbent material  132  is positioned in the Z axis direction of the tanks  9 . Therefore, the liquid absorbent material  132  is positioned above the tanks  9  in the use orientation of the tanks  9 . 
     The liquid absorbent material  132  extends along the Y axis. The liquid absorbent material  132  extends from the tank  91  to the tank  94 . Therefore, the liquid absorbent material  132  is positioned between the tanks  9  and the second casing  42 . The liquid absorbent material  132  is in contact with the inner side of the second casing  42  above the tanks  9  as shown in  FIG. 29 . Therefore, in the case where the ink supply device  4 D adopts an inverted orientation that is inverted from the use orientation, even if ink that has leaked from the open air port  66  of the tanks  9  adheres to the inner side of the second casing  42 , the adhered ink can be absorbed by the liquid absorbent material  132 . Accordingly, the possibility of soiling caused by the ink leakage can be suppressed to a low level. 
     POSITIONING EXAMPLE 3 
     An example of a positioning method for determining a position of the liquid absorbent material  132  with respect to the second casing  42  will be described. In Positioning Example 3, as shown in  FIG. 30 , a positioning part  133  is provided on the second casing  42 . The positioning part  133  is provided inside the second casing  42 , protrudes from inside the second casing  42  in the −Z axis direction, and is curved in the −X axis direction. In the positioning part  133 , a portion curved in the −X axis direction constitutes a supporting portion  134  that supports the liquid absorbent material  132 . The liquid absorbent material  132  is sandwiched between the internal wall of the second casing  42  and the supporting portion  134  of the positioning part  133 . Accordingly, the position of the liquid absorbent material  132  with respect to the second casing  42  can be determined. Note that the positioning part  133  is an example of a second positioning part. Moreover, the ink supply device  4 D in which the configuration of Positioning Example 3 is adopted is an example of a liquid supply device having the positioning part  133 . 
     In Positioning Example 3, the positioning part  133  is provided on the second casing  42 . However, the location in which the positioning part  133  is provided is not limited to the second casing  42 , and the tanks  9  can also be adopted. Furthermore, a configuration in which the positioning part  133  is provided on both the second casing  42  and the tanks  9  can be adopted. 
     EXAMPLE 12 
     It is also possible to apply Example 10 that is described above to Example 9. Specifically, a configuration in which the liquid absorbent material  121  and the liquid absorbent material  131  are added to the ink supply device  4 A ( FIG. 4 ) can also be adopted. The configuration in which the liquid absorbent material  121  and the liquid absorbent material  131  are added to the ink supply device  4 A ( FIG. 4 ) is indicated as an ink supply device  4 E of Example 12. With the ink supply device  4 E of Example 12, the number of liquid absorbent materials is higher, and thus the possibility of soiling caused by ink leakage can be further suppressed to a low level. 
     EXAMPLE 13 
     It is also possible to apply Example 11 that is described above to Example 9. Specifically, a configuration in which the liquid absorbent material  121  and the liquid absorbent material  132  are added to the ink supply device  4 A ( FIG. 4 ) can also be adopted. The configuration in which the liquid absorbent material  121  and the liquid absorbent material  132  are added to the ink supply device  4 A ( FIG. 4 ) is indicated as an ink supply device  4 F of Example 13. With the ink supply device  4 F of Example 13, the number of liquid absorbent materials is higher, and thus the possibility of soiling caused by ink leakage can be further suppressed to a low level. 
     EXAMPLE 14 
     It is also possible to apply Example 11 that is described above to Example 10. Specifically, a configuration in which the liquid absorbent material  131  and the liquid absorbent material  132  are added to the ink supply device  4 A ( FIG. 4 ) can also be adopted. The configuration in which the liquid absorbent material  131  and the liquid absorbent material  132  are added to the ink supply device  4 A ( FIG. 4 ) is indicated as an ink supply device  4 G of Example 14. With the ink supply device  4 G of Example 14, the number of liquid absorbent materials is higher, and thus the possibility of soiling caused by ink leakage can be further suppressed to a low level. 
     EXAMPLE 15 
     It is also possible to apply Example 11 and Example 10 that are described above to Example 9. Specifically, a configuration in which the liquid absorbent material  121 , the liquid absorbent material  131  and the liquid absorbent material  132  are added to the ink supply device  4 A ( FIG. 4 ) can also be adopted. The configuration in which the liquid absorbent material  121 , the liquid absorbent material  131  and the liquid absorbent material  132  are added to the ink supply device  4 A ( FIG. 4 ) is indicated as an ink supply device  4 H of Example 15. With the ink supply device  4 H of Example 15, the possibility of soiling caused by ink leakage can be further suppressed to a low level. 
     EXAMPLE 16 
     A configuration in which the liquid absorbent material  121 , the liquid absorbent material  131  and the liquid absorbent material  132  are in contact with one another as shown in  FIG. 31  in Example 15 that is described above can also be adopted. The configuration in which the liquid absorbent material  121 , the liquid absorbent material  131  and the liquid absorbent material  132  are in contact with one another is indicated as an ink supply device  4 J of Example 16. In the ink supply device  4 J of Example 16, the liquid absorbent material  121  and the liquid absorbent material  132  are in contact with each other, and the liquid absorbent material  132  and the liquid absorbent material  131  are in contact with each other. With the ink supply device  4 J of Example 16, the volume of the liquid absorbent materials can be increased, and thus the ability to absorb liquid can be improved. Therefore, with the ink supply device  4 J of Example 16, the possibility of soiling caused by ink leakage can be further suppressed to a low level. 
     EXAMPLE 17 
     In Example 16 that is described above, it is possible to form the liquid absorbent material  121 , the liquid absorbent material  131  and the liquid absorbent material  132  integrally with one another. A configuration in which the liquid absorbent material  121 , the liquid absorbent material  131  and the liquid absorbent material  132  are formed integrally with one another is indicated as an ink supply device  4 K of Example 17. The ink supply device  4 K has a liquid absorbent material  135  as shown in  FIG. 32 . The liquid absorbent material  135  has a configuration in which the liquid absorbent material  121 , the liquid absorbent material  131  and the liquid absorbent material  132  that are shown in  FIG. 31  are formed integrally with one another. In Example 17 as well, the same effect as Example 16 is obtained. Furthermore, in Example 17, the number of parts can be reduced, and thus the cost can be reduced. 
     Note that an example that is applicable to the ink supply device  4 A provided with the casing  7  is shown in each of Example 9 to Example 17 that are described above. However, each of Example 9 to Example 17 is also applicable to the liquid jet system  1  shown in  FIG. 3 . In the case where each of Example 9 to Example 17 is applied to the liquid jet system  1  shown in  FIG. 3 , a skilled person in the art can apply the configuration regarding the casing  7  to the casing  6  with appropriate changes and modifications. Moreover, in  FIG. 3 , the liquid absorbent material  121  is positioned at least at the height of the open air port  66 . In  FIG. 3 , in the liquid jet system  1 , the tanks  9  may be positioned in the range of the movement of the carriage  33  in the X axis direction, and may be arranged on the Y axis direction side relative to the range of the moving of the carriage  33  in the +Y axis direction, that is, the front surface side of the casing  6 . Within a tank mounting portion  136  in which the tanks  9  are arranged or mounted, the position of the liquid absorbent material  121  may be determined by the positioning method as shown in  FIG. 24  or  FIG. 25 , for example. Note that the tanks  9  may be formed integrally. 
     EXAMPLE 18 
     An ink supply device  4 L of Example 18 has a second casing  141  as shown in  FIG. 33 . In the ink supply device  4 L of Example 18, the second casing  42  of the ink supply device  4 A ( FIG. 4 ) is replaced by the second casing  141 . Except for that point, the ink supply device  4 L of Example 18 has the same configuration as the ink supply device  4 A. Therefore, in the following description, the same reference signs as the ink supply device  4 A are given to the same constituent elements as the ink supply device  4 A, and detailed description thereof is omitted. 
     The second casing  141  is provided with liquid holding portions  142  and guiding paths  143 . In this example, a plurality of liquid holding portions  142  and a plurality of guiding paths  143  are provided. In addition, in this example, the liquid holding portions  142  and the guiding paths  143  are provided in accordance with the number of the tanks  9 . Specifically, in this example, four liquid holding portions  142  and four guiding paths  143  are provided based on four tanks  9 . 
     The liquid holding portions  142  and the guiding paths  143  are each provided inside the second casing  141 , specifically, in a portion of the second casing  141  that faces the tank  9  side. The liquid holding portions  142  are positioned in a location in the second casing  141  that the tanks  9  face vertically upward, that is, a location in the second casing  141  that the tanks  9  face in the Z axis direction. Therefore, as shown in  FIG. 34 , in the inverted orientation of the ink supply device  4 L, the liquid holding portions  142  are positioned vertically below the tanks  9 . 
     As shown in  FIG. 35 , which is an enlarged diagram of Portion A in  FIG. 34 , the liquid holding portions  142  are each constituted as a recessed portion formed on the second casing  141 . The recessed portion formed as the liquid holding portion  142  is formed in a direction so as to become recessed in the Z axis direction. When ink is stored in the liquid holding portion  142  constituted as the recessed portion, the ink is easily kept by the liquid holding portion  142 . Accordingly, in the inverted orientation, even if the ink leaks out from the open air port  66  of the tank  9 , the leaked ink is easily kept by the liquid holding portions  142 . As a result, in the inverted orientation, even if the ink leaks out from the open air port  66 , the possibility of soiling caused by the ink leakage can be suppressed to a low level. Note that the liquid holding portions  142  are not limited to a recessed portion, and a groove formed on the second casing  141  can also be adopted. 
     The guiding paths  143  are each constituted as a groove formed on the second casing  141 . The groove formed as the guiding path  143  is formed in a direction so as to become recessed in the Z axis direction. The guiding path  143  constituted as the groove leads to the liquid holding portion  142  constituted as the recessed portion. Therefore, in the inverted orientation, even if ink leaks out from the open air port  66  of the tanks  9 , the leaked ink is easily guided to the liquid holding portions  142  by the guiding paths  143 . Accordingly, in the inverted orientation, even if the ink leaks out from the open air port  66  of the tanks  9 , the leaked ink is easily kept by the liquid holding portions  142 . As a result, in the inverted orientation, even if the ink leaks out from the open air port  66 , the possibility of soiling caused by the ink leakage can be further suppressed to a low level. 
     EXAMPLE 19 
     An ink supply device  4 M of Example 19 has a second casing  145  as shown in  FIG. 36 . In the ink supply device  4 M of Example 19, the second casing  141  of the ink supply device  4 L of Example 18 ( FIG. 33 ) is replaced by the second casing  145 . Except for that point, the ink supply device  4 M of Example 19 has the same configuration as the ink supply device  4 L of Example 18. Therefore, in the following description, the same reference signs as Example 18 are given to the same constituent elements as Example 18, and detailed description thereof is omitted. 
     The second casing  145  is provided with liquid holding portions  146 . In the second casing  145  of Example 19, the liquid holding portions  142  of Example 18 ( FIG. 33 ) are replaced by the liquid holding portions  146 . In other words, in the second casing  145  of Example 19, the recessed portions constituting the liquid holding portions  142  of Example 18 are omitted, and the liquid holding portions  146  are provided. Except for that point, the second casing  145  of Example 19 has the same configuration as the second casing  141  of Example 18. Therefore, in the following description, the same reference signs as Example 18 are given to the same constituent elements as Example 18, and detailed description thereof is omitted. 
     In Example 19, the liquid holding portions  146  are each constituted by a liquid absorbent material. The liquid holding portion  146  constituted by the liquid absorbent material has a property of absorbing liquid and holding the absorbed liquid. As the material of the liquid holding portion  146 , various materials such as foam, felt and a nonwoven fabric can be adopted. The liquid holding portion  146  constituted by the liquid absorbent material can hold ink. Accordingly, in the inverted orientation, if ink leaks out from the open air port  66  of the tanks  9 , the leaked ink is easily kept by the liquid holding portions  146 . As a result, similarly to Example 18, in the inverted orientation, even if the ink leaks out from the open air port  66 , the possibility of soiling caused by the ink leakage can be suppressed to a low level. 
     Moreover, in Example 19 as well, similarly to Example 18, the guiding paths  143  each constituted as a groove lead to the liquid holding portions  146  each constituted by the liquid absorbent material. Therefore, in the inverted orientation, even if ink leaks out from the open air port  66  of the tanks  9 , the leaked ink is easily guided to the liquid holding portions  146  by the guiding paths  143 . Accordingly, in the inverted orientation, even if the ink leaks out from the open air port  66  of the tanks  9 , the leaked ink is easily kept by the liquid holding portions  146 . As a result, in the inverted orientation, even if the ink leaks out from the open air port  66 , the possibility of soiling caused by the ink leakage can be further suppressed to a low level. 
     EXAMPLE 20 
     An ink supply device  4 N of Example 20 has a second casing  147  as shown in  FIG. 37 . In the ink supply device  4 N of Example 20, the second casing  141  of the ink supply device  4 L of Example 18 ( FIG. 33 ) is replaced by the second casing  147 . Except for that point, the ink supply device  4 N of Example 20 has the same configuration as the ink supply device  4 L of Example 18. Therefore, in the following description, the same reference signs as Example 18 are given to the same constituent elements as Example 18, and detailed description thereof is omitted. 
     The second casing  147  in Example 20 has a configuration in which the liquid holding portions  146  of the second casing  145  in Example 19 are added to the liquid holding portions  142  of the second casing  141  in Example 18. In other words, the second casing  147  in Example 20 has a configuration in which the second casing  141  in Example 18 and the second casing  145  in Example 19 are composited. Therefore, the detailed description of the second casing  147  in Example 20 is omitted. 
     In Example 20, the liquid holding portions  146  each constituted by a liquid absorbent material are added to the liquid holding portions  142  each constituted as a recessed portion, and thus ink is further easily kept by the liquid holding portions  142  and the liquid holding portions  146 . Accordingly, in the inverted orientation, even if the ink leaks out from the open air port  66 , the possibility of soiling caused by the ink leakage can be further suppressed to a low level. 
     In addition, in Example 20 as well, similarly to Example 18 and Example 19, the guiding paths  143  each constituted as the groove lead to the liquid holding portions  142  and the liquid holding portions  146 . Therefore, in the inverted orientation, even if ink leaks out from the open air port  66  of the tanks  9 , the leaked ink is easily guided to the liquid holding portions  142  and the liquid holding portions  146  by the guiding paths  143 . Accordingly, in the inverted orientation, even if the ink leaks out from the open air port  66  of the tanks  9 , the leaked ink is easily kept by the liquid holding portions  142  and the liquid holding portions  146 . As a result, in the inverted orientation, even if the ink leaks out from the open air port  66 , the possibility of soiling caused by the ink leakage can be further suppressed to a low level. 
     In the above embodiment, the liquid jet device may be a liquid jet device that consumes liquid other than ink by jetting, ejecting, or applying the liquid as a coating. Note that examples of the state of liquid that is ejected as minuscule droplets from the liquid jet device include a spherical shape, a tear shape, and a shape having a thread-like trailing end. Furthermore, the liquid in this case may be any material that can be consumed in the liquid jet device. For example, the liquid may be any material that is in a liquid phase, and examples thereof include materials in a liquid state having high or low viscosity, sol, gel water, and other materials that flow, such as inorganic solvent, organic solvent, solution, liquid resin, liquid metal (metallic melt), and the like. Furthermore, the examples include not only liquid, as one state of materials, but also materials in which solvent contains dissolved, dispersed, or mixed particles of functional material made of a solid, such as pigments or metal particles. Typical examples of the liquid include liquid crystal and the like other than ink as described in the above embodiments. Here, it is assumed that examples of the ink include various liquid state compositions such as commonly used water-based ink, oil-based ink, gel ink, and hot melt ink. Specific examples of the liquid jet device include liquid jet devices that eject liquid containing dispersed or dissolved materials such as electrode materials or coloring material used for producing liquid crystal displays, electro luminescence (EL) displays, field emission displays, color filters, and the like. The examples may further include liquid jet devices that eject bioorganic materials used to manufacture biochips, liquid jet devices that are used as precision pipettes and eject sample liquid, textile printing apparatus, micro-dispensers, and the like. The examples may further include liquid jet devices that eject lubricating oil for pinpoint application onto precision machines such as watches or cameras, liquid jet devices that eject transparent resin liquid such as ultraviolet curing resin onto a substrate in order to form minute hemispherical lenses (optical lenses) used for optical communications devices or the like. The examples may further include liquid jet devices that eject acidic or alkaline etching liquid in order to perform etching on a substrate or the like 
     The invention is not limited to the above-described embodiments, and can be achieved in various configurations without departing from the gist of the invention. For example, the technical features in the embodiments corresponding to the technical features in the aspects described in Summary can be replaced or combined as appropriate in order to solve some or all of the problems described above, or in order to achieve some or all of the aforementioned effects. Technical features that are not described as essential in the specification can be deleted as appropriate.