Patent Publication Number: US-2017355193-A1

Title: Liquid ejecting apparatus

Description:
TECHNICAL FIELD 
     The present invention relates to a liquid container and the like. 
     PRIOR ART 
     Ink jet printers are known in the prior art as one example of a liquid ejecting apparatus. It is possible for an ink jet printer to perform printing onto a printing medium, such as a paper sheet for printing, by discharging ink, which is one example of a liquid, from an ejecting head onto the printing medium. Among these liquid ejecting apparatuses, liquid ejecting apparatuses are known which have a liquid supplying apparatus where ink, which is retained in a tank which is one example of a liquid container, is supplied to an ejecting head (a printing head) via a tube (hose) (for example, refer to PTL 1). Here, there are times when the configuration where the liquid supplying apparatus is added to the liquid ejecting apparatus is referred to below as a liquid ejecting system. 
     CITATION LIST 
     Patent Literature 
     PTL 1: Japanese Unexamined Patent Application Publication No. 2012-20497 
     SUMMARY OF THE INVENTION 
     Problems to be Solved by the Invention 
     A technique is disclosed in PTL 1 described above where, in a tank which has a liquid container where it is possible for liquid to be contained and an air opening flow path where it is possible for air to be introduced into the liquid container, it is possible to reduce the possibility that liquid flows out from an air opening flow path to the outside even when the posturing of the tank changes. However, a technique, where it is difficult for liquid to flow out from the ejecting head in a state where the liquid ejecting apparatus which is connected to the tank tips over, is not disclosed in PTL 1 described above. 
     Means to Solve the Problems 
     The present invention is carried out in order to resolve at least a portion of the problems described above and can be realized as the following aspects and applied examples. 
     Applied Example 1 
     A liquid container where liquid is contained in order to be supplied with regard to a liquid ejecting apparatus which has a nozzle formation section where nozzles are formed, which performs printing onto a printing medium using liquid by ejecting the liquid from the nozzles toward the printing medium, and where a front end of the nozzle formation section and a rear end of the nozzle formation section are positioned along a discharge direction of the printing medium when a discharge opening of the liquid ejecting apparatus, which discharges the printing medium onto′ which printing is performed via the discharge opening, is the front side, wherein the liquid container is disposed so that the liquid surface of the liquid which is contained in the liquid container is lower than the rear end of the nozzle formation section in a first posture where the nozzles face in the horizontal direction and the front end of the nozzle formation section is positioned above the rear end. 
     According to the liquid container in this applied example, it is easy to suppress the liquid in the vicinity of the nozzles from being pressurized by the liquid which is contained in the liquid container since the liquid surface of the liquid which is contained in the liquid container is lower than the nozzle formation section even when the posture of the liquid ejecting apparatus is changed to the first posture. Due to this, it is possible to reduce the possibility that liquid flows out from the nozzles even when the flow path for liquid between the liquid container and the nozzle is not closed off in the first posture. 
     Applied Example 2 
     A liquid container which is the liquid container described above which has a liquid supply opening for supplying the liquid which is contained in the liquid container to the liquid ejecting apparatus and which is disposed so that the liquid surface is higher than the rear end of the nozzle formation section and the liquid supply opening is higher than the liquid surface in a second posture where the nozzles face in the horizontal direction and the front end of the nozzle formation section is positioned below the rear end. 
     In this applied example, it is easy for pressure due to the head of water of the liquid which is contained in the liquid container to block the liquid supply opening since the liquid supply opening is higher than the liquid surface of the liquid which is contained in the liquid container even when the liquid surface of the liquid which is contained in the liquid container is higher than the nozzle formation section due to the posture of the liquid ejecting apparatus changing to the second posture. Due to this, it is possible to reduce the possibility that liquid flows out from the nozzles even when the flow path for liquid between the liquid container and the nozzle is not closed off in the second posture. 
     Applied Example 3 
     A liquid container where it is possible for liquid to be contained in order to be supplied with regard to a liquid ejecting apparatus which has a nozzle formation section where nozzles are formed, which performs printing onto a printing medium using liquid by ejecting the liquid from the nozzles toward the printing medium, and where a front end of the nozzle formation section and a rear end of the nozzle formation section are positioned along a discharge direction of the printing medium when a discharge opening of the liquid ejecting apparatus, which discharges the printing medium onto which printing is performed via the discharge opening, is the front side, wherein the liquid container includes a first liquid containing section and a second liquid containing section, the first liquid containing section and the second liquid containing section each have a liquid supply opening for supplying the liquid which is contained in an inner section to the liquid ejecting apparatus, the first liquid containing section is disposed so that the liquid surface of the liquid which is contained in the first liquid containing section is lower than the rear end of the nozzle formation section in a first posture where the nozzles face in the horizontal direction and the front end of the nozzle formation section is positioned above the rear end and the second liquid containing section is disposed so that the liquid surface of the liquid which is contained in the second liquid containing section is higher than the rear end of the nozzle formation section and the liquid supply opening is higher than the liquid surface in the first posture, and the second liquid containing section is disposed so that the liquid surface of the liquid which is contained in the second liquid containing section is lower than the rear end of the nozzle formation section in a second posture where the nozzles face in the horizontal direction and the front end of the nozzle formation section is positioned below the rear end and the first liquid containing section is disposed so that the liquid surface of the liquid which is contained in the first liquid containing section is higher than the rear end of the nozzle formation section and the liquid supply opening is higher than the liquid surface in the second posture. 
     According to the liquid container in this applied example, it is easy to suppress the liquid in the vicinity of the nozzles from being pressurized by the liquid which is contained in the first liquid containing section since the liquid surface of the liquid which is contained in the first liquid containing section is lower than the nozzle formation section even when the posture of the liquid ejecting apparatus is changed to the first posture. In addition, it is easy for pressure due to the head of water of the liquid which is contained in the second liquid containing section to block the liquid supply opening since the liquid supply opening is higher than the liquid surface of the liquid which is contained in the second liquid containing section even when the liquid surface of the liquid which is contained in the second liquid containing section is higher than the nozzle formation section in the first posture. Due to this, it is possible to reduce the possibility that liquid flows out from the nozzles even when the flow path for liquid between the liquid container and the nozzle is not closed off in the first posture. In addition, it is easy to suppress the liquid in the vicinity of the nozzles from being pressurized by the liquid which is contained in the second liquid containing section since the liquid surface of the liquid which is contained in the second liquid containing section is lower than the nozzle formation section even when the posture of the liquid ejecting apparatus is changed to the second posture. In addition, it is easy for pressure due to the head of water of the liquid which is contained in the first liquid containing section to block the liquid supply opening since the liquid supply opening is higher than the liquid surface of the liquid which is contained in the first liquid containing section even when the liquid surface of the liquid which is contained in the first liquid containing section is higher than the nozzle formation section in the second posture. Due to this, it is possible to reduce the possibility that liquid flows out from the nozzles even when the flow path for liquid between the liquid container and the nozzle is not closed off in the second posture. 
     Applied Example 4 
     A liquid container which is the liquid container described above where the first liquid containing section and the second liquid containing section are disposed so that a region between the front end and the rear end of the nozzle formation section is symmetrical in a front and rear direction, which is a direction which links the front end and the rear end, with regard to a hypothetical region which extends in a direction which intersects with the front and rear direction. 
     In this applied example, it is possible for the first liquid containing section and the second liquid containing section to be disposed to line up in the front and rear direction. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective diagram illustrating a liquid ejecting system in an embodiment of the present invention. 
         FIG. 2  is a perspective diagram illustrating a liquid ejecting system in an embodiment of the present invention. 
         FIG. 3  is a perspective diagram illustrating a liquid ejecting system in an embodiment of the present invention. 
         FIG. 4  is a perspective diagram illustrating a constituent unit for a printer in an embodiment of the present invention. 
         FIG. 5  is a bottom surface diagram illustrating a printing head in an embodiment of the present invention. 
         FIG. 6  is a perspective diagram illustrating a breakdown of a tank in an embodiment of the present invention. 
         FIG. 7  is a side surface diagram when a tank in an embodiment of the present invention is viewed from a sheet member side. 
         FIG. 8  is a perspective diagram illustrating a case in an embodiment of the present invention. 
         FIG. 9  is a perspective diagram illustrating a case in an embodiment of the present invention. 
         FIG. 10  is a cross sectional diagram when an ink introduction opening, a supply opening, and an air communication opening in an embodiment of the present invention are cut along an XY plane. 
         FIG. 11  is a side surface diagram when a tank in an embodiment of the present invention is viewed from a sheet member side. 
         FIG. 12  is a side surface diagram when a tank in an embodiment of the present invention is viewed from a sheet member side. 
         FIG. 13  is a front surface diagram illustrating a printing head and a tank in an embodiment of the present invention. 
         FIG. 14  is a bottom surface diagram illustrating a printing head and a tank in Embodiment 1. 
         FIG. 15  is a bottom surface diagram illustrating a printing head and a tank in Embodiment 1. 
         FIG. 16  is a bottom surface diagram illustrating a printing head and a tank in Embodiment 2. 
         FIG. 17  is a bottom surface diagram illustrating a printing head and a tank in Embodiment 2. 
     
    
    
     DESCRIPTION OF THE EMBODIMENTS 
     An embodiment of the present invention will be described with reference to the diagrams with an example of a liquid ejecting system which includes an ink jet printer (which is referred to below as a printer) which is one example of a liquid ejecting apparatus. Here, there are times when the scale of the configuration and members differs in each of the diagrams in order for each of the configurations to be a size to such an extent where recognition is possible. 
     A liquid ejecting system  1  in the embodiment of the present invention has a printer  3  which is one example of a liquid ejecting apparatus and a tank unit  5  as shown in  FIG. 1 . The printer  3  has a first case  6 . The first case  6  configures the outer shell of the printer  3 . The tank unit  5  has a second case  7  and a plurality of (two or more) tanks  9 . The first case  6  and the second case  7  configure the outer shell of the liquid ejecting system  1 . The tank  9  is one example of a liquid container. It is possible for the liquid ejecting system  1  to perform printing onto a printing medium P such as a paper sheet for printing using ink which is one example of a liquid. 
     Here, XYZ axes which are coordinate axes orthogonal to each other are applied in  FIG. 1 . The XYZ axes are applied according to requirements in other diagrams in which the axes are shown. For each of the XYZ axes, the direction of the arrows indicates a + direction (plus direction) and the opposite to the direction of the arrows indicates a − direction (minus direction). In a state where the liquid ejecting system  1  is being used, the liquid ejecting system  1  is placed on a horizontal flat surface which is regulated in the X axis and Y axis. In a state where the liquid ejecting system  1  is being used, the Z axis is the axis which is orthogonal to the horizontal flat surface and the −Z axis direction is vertically downward. 
     A constituent unit  10  ( FIG. 4 ) of the printer  3  is contained in the first case  6 . The constituent unit  10  is constituent parts which execute printing actions in the printer  3 . The details on the constituent unit  10  will be described later. The plurality of tanks  9  are contained inside the second case  7  as shown in  FIG. 1  and each contain ink which is for printing. In the present embodiment, four of the tanks  9  are provided. Among the four of the tanks  9 , the types of ink are different for each of the tanks  9 . Four types of black, yellow, magenta, and cyan are adopted as the types of ink in the present embodiment. Then, one of each of the tank  9  which contains black ink, the tank  9  which contains yellow ink, the tank  9  which contains magenta ink, and the tank  9  which contains cyan ink are provided. The plurality of tanks  9  are provided on the outer side of the first case  6  in the liquid ejecting system  1 . For this reason, the plurality of tanks  9  are not built into the first case  6  which covers the constituent unit  10  in the liquid ejecting system  1 . 
     In addition, a sheet discharge section  11  which is one example of a discharge opening is provided in the printer  3 . In the printer  3 , the printing medium P is discharged from the sheet discharge section  11 . In the printer  3 , the surface where the sheet discharge section  11  is provided is set as a front surface  13 . In addition, the printer  3  has an operation panel  17  on an upper surface  15  which intersects with the front surface  13 . A power source button  18 A, other operation buttons  18 B, and the like are provided in the operation panel  17 . The tank unit  5  is provided in the first case  6  at a side section  19  which intersects with the front surface  13  and the upper surface  15 . A window section  21  is provided in the second case  7 . The window section  21  is provided in the second case  7  at a side section  27  which intersects with a front surface  23  and an upper surface  25 . The window section  21  has optical transparency. Then, the four tanks  9  described above are provided at a position which overlaps with the window section  21 . For this reason, it is possible for an operator who is using the liquid ejecting system  1  to visually confirm the four tanks  9  via the window section  21 . 
     At least a portion of parts in each of the tanks  9  which oppose the window section  21  have optical transparency in the present embodiment. It is possible to visually confirm the ink inside the tanks  9  from parts in each of the tanks  9  which have optical transparency. Accordingly, it is possible for an operator to visually confirm the amount of ink in each of the tanks  9  by visually confirming the four tanks  9  via the window section  21 . That is, it is possible for at least a portion of part in the tanks  9  which opposes the window section  21  to be utilized as a visually confirming section where it is possible to visually confirm the amount of ink. The first case  6  and the second case  7  are configured from bodies which are separate from each other. For this reason, it is possible for the second case  7  to be separated from the first case  6  in the present embodiment as shown in  FIG. 2 . The second case  7  is joined with the first case  6  using an attachment pin  31 . In addition, the second case  7  covers at least a portion of the tanks  9  such as, for example, the front surface, the upper surface, and the side surfaces as shown in  FIG. 2 . Here, an upper limit mark  28  which indicates the upper limit for the amount of ink and a lower limit mark  29  which indicates the lower limit for the amount of ink are provided in each of the tanks  9  at parts which oppose the window section  21 . It is possible for an operator to ascertain the amount of ink in each of the tanks  9  with the upper limit mark  28  and the lower limit mark  29  as indicators. 
     In addition, the tank unit  5  has a support frame  32 . The four tanks  9  are supported by the support frame  32 . The support frame  32  is configured using a separate body to the first case  6 . For this reason, it is possible for the support frame  32  to be separated from the first case  6  in the present embodiment as shown in  FIG. 3 . The support frame  32  is joined with the first case  6  using an attachment pin  33 . In this manner, the tank unit  5  ( FIG. 1 ) is attached to the outer side of the first case  6  in the present embodiment. 
     The printer  3  has a printing section  35  and supply tubes  36  as shown in  FIG. 4  which is a perspective diagram illustrating the constituent unit  10 . The printing section  35  has a carriage  37 , a printing head  38 , and four relay units  39 . The printing head  38  and the four relay units  39  are mounted on the carriage  37 . The supply tubes  36  have flexibility and are provided between the tanks  9  and the relay units  39 . The ink inside the tanks  9  is sent to the relay units  39  via the supply tubes  36 . The relay units  39  relay the ink, which is supplied from the tanks  9  via the supply tubes  36 , to the printing head  38 . The printing head  38  discharges the ink which is supplied as ink droplets. 
     Here, details on the printing head  38  will be described. The printing head  38  has a nozzle surface  41  as shown in FIG.  5  which is a bottom surface diagram. A plurality of nozzles  42  which discharge ink droplets are formed in the nozzle surface  41 . Here, the nozzles  42  are exaggerated and the number of the nozzles  42  is reduced in  FIG. 5  so that it is easy for the nozzles  42  to be clearly seen. The plurality of nozzles  42  in the printing head  38  are configured from eight nozzle rows  43  which are aligned along the X axis. The eight nozzle rows  43  line up in a state so as to be spaced from each other along the Y axis. The plurality of nozzles  42  in each of the nozzle rows  43  are formed with a predetermined nozzle spacing L along the X axis. Below, in cases where each of the eight nozzle rows  43  are to be separately identified, the eight nozzle rows  43  are each labelled as a nozzle row  43 A, a nozzle row  43 B, a nozzle row  43 C, a nozzle row  43 D, a nozzle row  43 E, a nozzle row  43 F, a nozzle row  43 G, and a nozzle row  43 H. 
     In the printing head  38 , the nozzle row  43 A and the nozzle row  43 B are shifted away from each other by a distance of L/2 along the X axis. The nozzle row  43 C and the nozzle row  43 D are also shifted away from each other by a distance of L/2 along the X axis. In the same manner, the nozzle row  43 E and the nozzle row  43 F are also shifted away from each other by a distance of L/2 along the X axis, and the nozzle row  43 G and the nozzle row  43 H are also shifted away from each other by a distance of L/2 along the X axis. The eight nozzle rows  43  in the printing head  38  are segmented for each type of ink. In the present embodiment, the nozzles  42  which belong to the nozzle row  43 A and the nozzle row  43 B discharge black (K) ink as ink droplets. The nozzles  42  which belong to the nozzle row  43 C and the nozzle row  43 D discharge cyan (C) ink as ink droplets. The nozzles  42  which belong to the nozzle row  43 E and the nozzle row  43 F discharge magenta (M) ink as ink droplets. The nozzles  42  which belong to the nozzle row  43 G and the nozzle row  43 H discharge yellow (Y) ink as ink droplets. 
     The plurality of nozzles  42  in the nozzle surface  41  form a nozzle formation section  44 . The nozzle formation section  44  is a region which includes all of the nozzles  42 , which perform discharging of ink droplets, out of the plurality of nozzles  42 . In addition, the nozzle formation section  44  is a region which is surrounded by the outer edges of the plurality of nozzles  42 , which are positioned on the far outer edges among the nozzles  42  which are included in the nozzle formation section  44 , being joined together over the shortest possible distance. The nozzle formation section  44  is regulated by the plurality of nozzles  42  which are positioned on the far outer edges among the nozzles  42  which are included in the nozzle formation section  44 . The nozzles  42  which do not communicate with the supply tubes  36  are not included among the plurality of nozzles  42  which regulate the nozzle formation section  44 . In the present embodiment, in the liquid ejecting system  1  which is shown in  FIG. 1 , the front surface  13  side where the sheet discharge section  11  is provided is defined as the front side and the opposite side to the front surface  13  side is defined as the rear side. Then, in the present embodiment, in the bottom surface diagram of the nozzle surface  41  ( FIG. 5 ), the part which is positioned farthest to the Y axis direction out of the nozzle formation section  44 , that is, the part which is positioned on the front side of the liquid ejecting system  1  is defined as a front end  45  of the nozzle formation section  44 . In addition, the part which is positioned farthest to the −Y axis direction out of the nozzle formation section  44  is defined as a rear end  46  of the nozzle formation section  44 . 
     In addition, the printer  3  which is shown has a medium transport mechanism (which is not shown in the diagram) and a head transport mechanism (which is not shown in the diagram) as shown in  FIG. 4 . The medium transport mechanism transports the printing medium P along the Y axis direction by a transport roller  51  ( FIG. 4 ) being driven due to motive force from a motor which is not shown in the diagram. The head transport mechanism transports the carriage  37  along the X axis direction by motive force from a motor  53  being transferred to the carriage  37  via a timing belt  55 . The printing head  38  is mounted on the carriage  37 . For this reason, it is possible for the printing head  38  to be transported in the X axis direction via the carriage  37  using the head transport mechanism. Here, the printing head  38  is supported by the carriage  37  in a state of facing the printing medium P. Printing is carried out on the printing medium P by ink being discharged from the printing head  38  while the relative position of the printing head  38  with regard to the printing medium P is changed using the medium transport mechanism and the head transport mechanism. 
     The tank  9  will be described. The tank  9  has a case  61  which is one example of a tank main body and a sheet member  63  as shown in  FIG. 6 . The case  61  is configured using, for example, a synthetic resin such as nylon or polypropylene. In addition, the sheet member  63  is formed in a film form using a synthetic resin (for example, nylon, polypropylene, or the like) and has flexibility. In the present embodiment, the sheet member  63  has optical transparency. The tank  9  has a configuration where the case  61  and the sheet member  63  are bonded together. A bonding section  64  is provided in the case  61 . Shading is carried out for the bonding section  64  in  FIG. 6  so that the configuration is easy to understand. The sheet member  63  is bonded together with the bonding section  64  of the case  61 . In the present embodiment, the case  61  and the sheet member  63  are bonded together through adhesion. 
     The tank  9  has a containing section  65  and a communication section  67  as shown in  FIG. 7 . The communication section  67  has an air chamber  68  and a communication path  73 . Ink is contained in the tank  9  inside the containing section  65 . Here, the state where the tank  9  is viewed from the sheet member  63  side is shown in  FIG. 7  and the case  61  which is beyond the sheet member  63  is shown in the diagram. The containing section  65 , the air chamber  68 , and the communication path  73  are partitioned from each other by the bonding section  64 . The case  61  has a base wall  80 , a first wall  81 , a second wall  82 , a third wall  83 , a fourth wall  84 , a fifth wall  85 , a sixth wall  86 , and a seventh wall  87 . The air chamber  68  and a portion of the communication path  73  are disposed on the second wall  82  on the opposite side to the containing section  65  side. The containing section  65  is surrounded by the first wall  81 , the second wall  82 , the third wall  83 , and the fourth wall  84  when the base wall  80  is viewed as a planar view from the sheet member  63  side. Here, the fourth wall  84  faces the window section  21  of the second case  7 . That is, the part in the tank  9  which has optical transparency is included in the fourth wall  84 . 
     In addition, the air chamber  68  is surrounded by the second wall  82 , the fifth wall  85 , the sixth wall  86 , and the seventh wall  87  when the base wall  80  is viewed as a planar view from the sheet member  63  side. Here, the base wall  80  of the containing section  65  and the base wall  80  of the air chamber  68  are the same wall. That is, in the present embodiment, the base wall  80  is shared by the containing section  65  and the air chamber  68 . The first wall  81 , the second wall  82 , the third wall  83 , and the fourth wall  84  each intersect with the base wall  80  as shown in  FIG. 8 . The second wall  82  is positioned more to the Z axis direction side than the first wall  81 . The first wall  81  and the second wall  82  are opposed to each other so as to interpose the base wall  80 . The fourth wall  84  is positioned more to the X axis direction side than the third wall  83 . The third wall  83  and the fourth wall  84  are opposed to each other so as to interpose the base wall  80 . The third wall  83  intersects with each of the first wall  81  and the second wall  82 . The fourth wall  84  also intersects with each of the first wall  81  and the second wall  82 . 
     The first wall  81 , the second wall  82 , the third wall  83 , and the fourth wall  84  protrude from the base wall  80  in the −Y axis direction. Due to this, a recess section  91  is configured using the first wall  81 , the second wall  82 , the third wall  83 , and the fourth wall  84  which extend from the main wall, where the base wall  80  is the main wall, in the −Y axis direction. The recess section  91  is configured with an orientation so as to be recessed toward the Y axis direction. The recess section  91  is open toward the −Y axis direction, that is, toward the sheet member  63  ( FIG. 6 ) side. In other words, the recess section  91  is provided with an orientation so as to be recessed toward the Y axis direction, that is, toward the opposite side to the sheet member  63  ( FIG. 6 ) side. Then, when the sheet member  63  is bonded together with the case  61 , the containing section  65  is configured due to the recess section  91  being closed off by the sheet member  63 . Here, each of the base wall  80  and the first wall  81  to the seventh wall  87  are not limited to being flat walls and may be walls include irregularities. 
     The fifth wall  85  protrudes from the second wall  82  toward the opposite side of the second wall  82  to the first wall  81  side, that is, toward the +Z axis direction side of the second wall  82  as shown in  FIG. 7 . The sixth wall  86  protrudes from the second wall  82  toward the opposite side of the second wall  82  to the first wall  81  side, that is, toward the +Z axis direction side of the second wall  82 . The sixth wall  86  is positioned more to the X axis direction side than the fifth wall  85 . The fifth wall  85  and the sixth wall  86  are provided at positions which are face to face to each other so as to interpose the air chamber  68 . The seventh wall  87  is positioned more to the Z axis direction side than the second wall  82 . The second wall  82  and the seventh wall  87  are provided at positions which are face to face to each other so as to interpose the air chamber  68 . The fifth wall  85  intersects with each of the second wall  82  and the seventh wall  87 . The sixth wall  86  also intersects with each of the second wall  82  and the seventh wall  87 . 
     The fifth wall  85 , the sixth wall  86 , and the seventh wall  87  protrudes from the base wall  80  in the −Y axis direction as shown in  FIG. 8 . Due to this, a recess section  99  is configured using the second wall  82 , the fifth wall  85 , the sixth wall  86 , and the seventh wall  87  which extend from the main wall, where the base wall  80  is the main wall, in the −Y axis direction. The recess section  99  is configured with an orientation so as to be recessed toward the Y axis direction. The recess section  99  is open toward the −Y axis direction, that is, toward the sheet member  63  ( FIG. 6 ) side. In other words, the recess section  99  is provided with an orientation so as to be recessed toward the Y axis direction, that is, toward the opposite side to the sheet member  63  ( FIG. 6 ) side. Then, when the sheet member  63  is bonded together with the case  61 , the air chamber  68  is configured due to the recess section  99  being closed off by the sheet member  63 . Here, the amounts of protruding by the first wall  81  to the seventh wall  87  from the base wall  80  are set to amounts of protruding which are the same to each other. 
     The third wall  83  and the fifth wall  85  have a difference in levels. The third wall  83  is positioned more to the fourth wall  84  side than the fifth wall  85 , that is, more to the X axis direction side than the fifth wall  85 . In addition, the fourth wall  84  and the sixth wall  86  have a difference in levels. The sixth wall  86  is positioned more to the third wall  83  side than the fourth wall  84 , that is, more to the −X axis direction side than the fourth wall  84 . Then, an ink introduction section  101  is provided between the fourth wall  84  and the sixth wall  86  in a state when the base wall  80  is viewed as a planar view from the sheet member  63  side. The ink introduction section  101  is provided in the second wall  82 . 
     An overhang section  105  is provided in the case  61  as shown in  FIG. 8 . The communication path  73  is provided in the overhang section  105 . The overhang section  105  has a part  105 A which overhangs from the second wall  82  toward the Z axis direction side along the edge of the opening of the recess section  91  in a region of the second wall  82  which is more to the X axis direction side than the sixth wall  86 . The part  105 A overhangs from the sixth wall  86  toward the X axis direction side along the edge of the opening of the recess section  99  in the sixth wall  86 . In addition, the overhang section  105  has a part  105 B which overhangs from the seventh wall  87  toward the Z axis direction side. In addition, the overhang section  105  has a part  105 C which overhangs from the fifth wall  85  toward the −X axis direction side along the edge of the opening of the recess section  99  in the fifth wall  85 . In addition, the overhang section  105  has a part  105 D which overhangs from the third wall  83  toward the −X axis direction side along the edge of the opening of the recess section  91  in the third wall  83 . The communication path  73  is configured as a groove  108  which is provided in the overhang section  105  with an orientation so as to be recessed toward the opposite side to the sheet member  63  ( FIG. 6 ) side. 
     Here, a recess section  109  is provided inside the recess section  91  as shown in  FIG. 8 . The recess section  109  is surrounded by an eight wall  111 , a ninth wall  112 , a tenth wall  113 , and the fourth wall  84 . The recess section  109  is provided with an orientation so as to be recessed from the first wall  81  toward the opposite side of the first wall  81  to the second wall  82 , that is, from the first wall  81  to the −Z axis direction side. The eight wall  111  and the ninth wall  112  are each provided in the first wall  81  and protrude from the first wall  81  toward the opposite side of the first wall  81  to the second wall  82 , that is, from the first wall  81  to the −Z axis direction side. 
     The eight wall  111  is positioned between the fourth wall  84  and the third wall  83  and opposes the fourth wall  84  so as to interpose the tenth wall  113 . The ninth wall  112  is positioned between the base wall  80  and the sheet member  63  ( FIG. 6 ) and opposes the sheet member  63  so as to interpose the tenth wall  113 . The tenth wall  113  is positioned more to the opposite side to the second wall  82  side than the first wall  81 , that is, more to the −Z axis direction side than the first wall  81 . The tenth wall  113  opposes the second wall  82 . The eight wall  111  intersects with the first wall  81 , the ninth wall  112 , and the tenth wall  113 . The ninth wall  112  intersects with the first wall  81 , the fourth wall  84 , and the tenth wall  113 . The tenth wall  113  intersects with the fourth wall  84 . 
     The eight wall  111 , the ninth wall  112 , the tenth wall  113 , and the fourth wall  84  which surround the recess section  109  configure a supply section  114  as shown in  FIG. 8 . A connection section  115  is provided in the supply section  114 . The connection section  115  is provided in the eight wall  111 . The connection section  115  is provided in the eight wall  111  on the opposite side to the recess section  109  side. The connection section  115  protrudes from the eight wall  111  toward the opposite side to the ninth wall  112  side, that is, from the eight wall  111  to the third wall  83  side. The connection section  115  is formed in a cylindrical shape as shown in  FIG. 9 . A supply opening  116  is formed in the connection section  115 . The supply opening  116  is an opening which is formed in the connection section  115  and is an outlet for ink from the tank  9 . The supply tube  36  ( FIG. 4 ) is connected with the connection section  115 . Ink which is contained in the tank  9  is sent from the connection section  115  to the supply tube  36  through the supply opening  116 . Ink which is sent to the supply tube  36  is lead to the printing head  38  by the supply tube  36 . 
     In addition, an air communication opening  118  is provided in the seventh wall  87  as shown in  FIG. 8 . The air communication opening  118  protrudes from the seventh wall  87  toward the opposite side of the seventh wall  87  to the second wall  82  side, that is, to the Z axis direction side of the seventh wall  87 . The air communication opening  118  is provided at a position which overlaps with the recess section  99  when the seventh wall  87  is viewed as a planar view, that is, when the seventh wall  87  is viewed as a planar view over the XY plane. The air communication opening  118  communicates between the outer side of the case  61  and the inner side of the recess section  99 . The air communication opening  118  is a flow path for air where it is possible for air from the outer side of the case  61  to be introduced to the inner side of the recess section  99 . Here, the bonding section  64  is provided in the case  61  along the contours of each of the recess section  91 , the recess section  99 , the recess section  109 , and the communication path  73 . 
     The sheet member  63  faces the base wall  80  so as to interpose the first wall  81  to the seventh wall  87  as shown in  FIG. 6 . The sheet member  63  has a size which covers the recess section  91 , the recess section  99 , the recess section  109 , and the overhang section  105  ( FIG. 8 ) in a planar view. The sheet member  63  is adhered to the bonding section  64 . Due to this, the recess section  91 , the recess section  99 , the recess section  109 , and the communication path  73  are sealed using the sheet member  63 . For this reason, it is possible for the sheet member  63  to be seen as a lid with regard to the case  61 . 
     The communication path  73  has a communication opening  121  and a communication opening  122  as shown in  FIG. 7 . The communication opening  121  is an open section which opens toward the inner side of the air chamber  68 . The communication opening  122  is an open section which opens toward the inner side of the containing section  65 . The air chamber  68  is linked with the containing section  65  from the communication opening  121  through the communication opening  122  via the communication path  73 . Due to the above, the containing section  65  is linked with the outside of the tank  9  via the communication path  73 , the air chamber  68 , and the air communication opening  118 . That is, the communication section  67  is link to communicate between the air communication opening  118  and the containing section  65 . Air which flows from the air communication opening  118  into the inside of the air chamber  68  flows into the inside of the containing section  65  via the communication path  73 . 
     The ink introduction section  101  is provided in the second wall  82 . The ink introduction section  101  is provided inside a recess section  131  which is surrounded by the sixth wall  86 , the overhang section  105 , the fourth wall  84 , and the base wall  80  as shown in  FIG. 8 . As described previously, the overhang section  105  protrudes more to the seventh wall  87  side than the second wall  82 . In addition, the sixth wall  86  also protrudes more to the seventh wall  87  side than the second wall  82 . In the same manner, the base wall  80  and the fourth wall  84  also protrude more to the seventh wall  87  side than the second wall  82  in the present embodiment. Then, the overhang section  105  intersects with both the fourth wall  84  and the sixth wall  86 . In addition, the base wall  80  intersects with both the fourth wall  84  and the sixth wall  86 . For this reason, the region in the second wall  82 , which is more to the fourth wall  84  side than the sixth wall  86 , configures the recess section  131  which is surrounded by the sixth wall  86 , the overhang section  105 , the fourth wall  84 , and the base wall  80 . The recess section  131  is provided with an orientation so as to be recessed from the second wall  82  side toward the first wall  81  side. 
     Due to the configuration described above, the ink introduction section  101  is surrounded by the sixth wall  86 , the overhang section  105 , the fourth wall  84 , and the base wall  80 . In other words, the ink introduction section  101  is provided inside a region in the second wall  82  which is surrounded by the sixth wall  86 , the overhang section  105 , the fourth wall  84 , and the base wall  80 . Then, the recess section  131  has a function as an ink receiving section. It is possible for the ink receiving section to, for example, receive ink which has leaked out from the ink introduction section  101  and ink which drips down during insertion. In this manner, the recess section  131  has a function as the ink receiving section which receives ink. 
     The ink introduction section  101  has an opening  132  and a side wall  133  as shown in  FIG. 10  which is a cross sectional diagram when the ink introduction section  101 , the supply opening  116 , and the air communication opening  118  are cut along the XZ plane. The opening  132  is a through hole which is provided in the second wall  82 . The opening  132  is an intersection section where the ink introduction section  101  and the recess section  91  (the containing section  65 ) intersect. It is possible to also adopt a configuration where the side wall  133  protrudes to the inner side of the recess section  91  (the containing section  65 ) as the configuration of the ink introduction section  101 . Even with a configuration where the side wall  133  protrudes to the inner side of the recess section  91  (the containing section  65 ), the intersection section where the ink introduction section  101  and the recess section  91  (the containing section  65 ) intersect is defined as the opening  132 . The recess section  91  is linked with the outer side of the recess section  91  via the opening  132  which is a through hole. The side wall  133  is provided on the second wall  82  on the opposite side to the first wall  81  side, surrounds the periphery of the opening  132 , and forms the ink introduction path. The side wall  133  protrudes from the second wall  82  toward the opposite side to the first wall  81  side. Here, in the present embodiment, the side wall  133  protrudes more to the opposite side to the first wall  81  side than each of the base wall  80  and the fourth wall  84 . It is possible for prevent ink which is held in the recess section  131  from flowing into the opening  132  due to the side wall  133 . 
     Ink  141  is contained in the tank  9  in an inner section of the containing section  65  as shown in  FIG. 11  which is a side surface diagram when the tank  9  is viewed from the sheet member  63  side. In  FIG. 11 , illustration of the sheet member  63  is omitted and shading is carried out for the bonding section  64  so that it is easy for the configuration to be clearly seen. The ink  141  inside the containing section  65  is supplied from the supply opening  116  ( FIG. 10 ) which is formed in the connection section  115  to the printing head  38 . In the present embodiment, the supply tube  36  is connected with the supply opening  116  and there is a cap  143  on the ink introduction section  101  in a state where the ink ejecting system  1  is being used for printing. The ink  141  inside the containing section  65  reaches from the supply opening  116  to the printing head  38  due to suction inside the supply tube  36  via the relay unit  39 . 
     The ink  141  inside the containing section  65  is sent to the printing head  38  side in accompaniment with printing using the printing head  38 . For this reason, pressure inside the containing section  65  is lower than air pressure in accompaniment with printing using the printing head  38 . When pressure inside the containing section  65  is lower than air pressure, air inside the containing section  65  flows into the inside of the containing section  65  through the communication path  73 . Due to this, it is easy for pressure inside the containing section  65  to be maintained at air pressure. Due to the above, the ink  141  inside the tank  9  is supplied to the printing head  38 . When the ink  141  inside the containing section  65  in the tank  9  is consumed and the remaining amount of the ink  141  becomes low, it is possible for an operator to replenish new ink into the inside of the containing section  65  from the ink introduction section  101 . 
     It is possible for the communication path  73  to be segmented into a first flow path  151 , a second flow path  152 , a third flow path  153 , a fourth flow path  154 , a fifth flow path  155 , and a sixth flow path  156  as shown in  FIG. 12 . The first flow path  151  is toward the fourth wall  84  along the second wall  82 , that is, along the X axis direction with the communication opening  121  as a starting point. The first flow path  151  reaches from the communication opening  121  to a reverse section  161 . The reverse section  161  is a part where the orientation of the flow path which is the communication path  73  is reversed. The orientation of the flow path is reversed from the X axis direction to the −X axis direction at the reverse section  161 . Here, in the flow path for air which reaches from the air communication opening  118  to the containing section  65 , the air communication opening  118  side is set as the upstream side and the communication opening  122  side is set as the downstream side. 
     The second flow path  152  is from the reverse section  161  toward the sixth wall  86  along the extending direction of the first flow path  151 , that is, along the −X axis direction. The second flow path  152  reaches from the reverse section  161  to a curve section  162 . The curve section  162  is a part where the orientation of the flow path which is the communication path  73  is curved. The orientation of the flow path is curved from the −X axis direction to the Z axis direction at the curve section  162 . The third flow path  153  is from the curve section  162  toward the seventh wall  87  along the sixth wall  86 , that is, along the Z axis direction. The third flow path  153  reaches from the curve section  162  to a curve section  163 . The curve section  163  is a part where the orientation of the flow path which is the communication path  73  is curved. The orientation of the flow path is curved from the Z axis direction to the −X axis direction at the curve section  163 . 
     The fourth flow path  154  is from the curve section  163  toward the fifth wall  85  along the seventh wall  87 , that is, along the −X axis direction. The fourth flow path  154  is positioned more to the Z axis direction side (above) than the air chamber  68 . The fourth flow path  154  reaches from the curve section  163  to a curve section  164 . The curve section  164  is a part where the orientation of the flow path which is the communication path  73  is curved. The orientation of the flow path is curved from the −X axis direction to the −Z axis direction at the curve section  164 . The fifth flow path  155  is from the curve section  164  toward the first wall  81  along the fifth wall  85 , that is, along the −Z axis direction. The fifth flow path  155  reaches from the curve section  164  to a reverse section  165 . 
     As described above, the fourth flow path  154  is positioned above the air chamber  68 . That is, a portion of the communication path  73  is positioned above the air chamber  68 . According to this configuration, it is difficult for ink, which flows from the containing section  65  into the inside of the communication path  73 , to rise up above the air chamber  68  due to the action of gravity. For this reason, it is difficult for ink, which flows from the containing section  65  into the inside of the communication path  73 , to reach the air chamber  68 . As a result, it is easy to suppress ink, which flows from the containing section  65  into the inside of the communication path  73 , to leak out from the tank  9 . 
     In addition, the third flow path  153  and the fifth flow path  155  are positioned in the tank  9  on opposite sides to each other so as to interpose the air chamber  68 . According to this configuration, it is possible for the flow path of the communication path  73  to be lengthened due to the communication path  73  being formed so as to wind around the periphery of the air chamber  68  by utilizing the space in the periphery of the air chamber  68 . Lengthening of the flow path of the communication path  73  is preferable from the point of view that it is difficult for the liquid component of ink inside the containing section  65  to evaporate, from the point of view that it is difficult for ink which flows from the containing section  65  into the inside of the communication path  73  to reach the air chamber  68 , and the like. 
     The reverse section  165  is a part where the orientation of the flow path which is the communication path  73  is reversed. The orientation of the flow path is reversed from the −Z axis direction to the +Z axis direction at the reverse section  165 . The sixth flow path  156  is from the reverse section  165  toward the second wall  82  along the third wall  83 , that is, along the Z axis direction. The sixth flow path  156  reaches from the reverse section  165  to the communication opening  122  through a curve section  166 . The curve section  166  is a part where the orientation of the flow path which is the communication path  73  is curved. The communication path  73  is linked with the inside of the containing section  65  via the communication opening  122  with the orientation of the flow path curved from the +Z axis direction to the X axis direction at the curve section  166 . 
     In the present embodiment, the nozzle surface  41  of the printing head  38  is positioned above the upper limit mark  28  in the tank  9  as shown in  FIG. 13  with the liquid ejecting system  1  in a posture in a state of being used where the liquid ejecting system  1  is placed along a flat horizontal surface (referred to as usage posture). For this reason, as long as the amount of ink inside the tank  9  does not surpass the upper limit, a liquid surface  171  of the ink inside the tank  9  is positioned below the nozzle surface  41 . For this reason, the head of water in the tank  9  is lower than the head of water in the printing head  38 . Due to this, it is easy to suppress the liquid in the vicinity of the nozzles  42  ( FIG. 5 ) from being pressurized by the ink which is contained in the tank  9 . As a result, it is possible to suppress ink from flowing out from the nozzles  42 . Furthermore, the nozzle surface  41  is positioned above an inner wall  82 A of the second wall  82  in the present embodiment. For this reason, the liquid surface  171  of the ink is positioned below the nozzle surface  41  even when ink is introduced into the inside of the tank  9  to surpass the upper limit mark  28 . Due to this, it is possible to further suppress ink from flowing out from the nozzles  42 . 
     Embodiments of the positioning of the tank  9  with regard to the printing head  38  will be described. Here, the embodiment of the positioning of the tank  9  with regard to the printing head  38  along the Y axis will be described. 
     Embodiment 1 
     In Embodiment 1, in a first posture where the front surface  13  of the liquid ejecting system  1  which is shown in  FIG. 1  faces vertically upward, the four tanks  9  are disposed so that the liquid surface  171  of the ink inside the tanks  9  is lower than the rear end  46  of the nozzle formation section  44  of the nozzle surface  41  as shown in  FIG. 14 . Here, in the first posture, the Y axis direction is the vertically upward direction and the −Y axis direction is the vertically downward direction. In the first posture, the plurality of nozzles  42  which are shown in  FIG. 5  face in the horizontal direction and the front end  45  of the nozzle formation section  44  is positioned above the rear end  46 . 
     In Embodiment 1, the liquid surface  171  of the ink is positioned below the plurality of nozzles  42  ( FIG. 5 ) since the tanks  9  are disposed so that the liquid surface  171  of the ink inside the tanks  9  is lower than the rear end  46  of the nozzle formation section  44  in the first posture. For this reason, the head of water in the tanks  9  is lower than the head of water in the printing head  38 . Due to this, it is easy to suppress the ink in the vicinity of the nozzles  42  from being pressurized by the ink which is contained in the tanks  9 . As a result, it is possible to suppress ink from flowing out from the nozzles  42 . Due to this, it is possible to reduce the possibility that ink flows out from the nozzles  42  even when the flow path for ink between the tanks  9  and the printing head  38  is not closed off in the first posture. 
     Furthermore, the tanks  9  are disposed in Embodiment 1 at positions so that the liquid surface  171  inside the tanks  9  is higher than the rear end  46  of the nozzle formation section  44  of the nozzle surface  41  as shown in  FIG. 15  in a second posture where the front surface  13  of the liquid ejecting system  1  which is shown in  FIG. 1  faces vertically downward. Furthermore, the tanks  9  are disposed in the second posture so that the connection sections  115  of the tanks  9  are higher than the liquid surface  171 . Here, in the second posture, the −Y axis direction is the vertically upward direction and the Y axis direction is the vertically downward direction. In the second posture, the plurality of nozzles  42  which are shown in  FIG. 5  face in the horizontal direction and the front end  45  of the nozzle formation section  44  is positioned below the rear end  46 . 
     In Embodiment 1, the connection sections  115  of the tanks  9  are higher than the liquid surface  171  even when the liquid surface  171  is higher than the nozzle formation section  44  in the second posture. That is, in Embodiment 1, the supply openings  116  ( FIG. 9 ) of the tanks  9  are higher than the liquid surface  171  even when the liquid surface  171  is higher than the nozzle formation section  44  in the second posture. Due to this, it is easy for pressure due to the head of water of the ink which is contained in the tanks  9  to block the liquid supply openings  116 . For this reason, it is easy to suppress the ink in the vicinity of the nozzles  42  from being pressurized by the ink which is contained in the tanks  9 . As a result, it is possible to suppress ink from flowing out from the nozzles  42 . For this reason, in Embodiment 1, it is possible to reduce the possibility that ink flows out from the nozzles  42  even when the flow path for ink between the tanks  9  and the printing head  38  is not closed off in the second posture. 
     In Embodiment 1 described above, the four tanks  9  which configure the tank unit  5  correspond to the liquid containers. In Embodiment 1, the four tanks  9  which configure the tank unit  5  are provided independently to each other. However, the configuration of the tank unit  5  is not limited to this. It is possible to adopt a configuration as the configuration of the tank unit  5  where, for example, the four tanks  9  which configure the tank unit  5  are integrated. As the configuration where the four tanks  9  are integrated, it is possible to adopt a configuration where, for example, the four tanks  9  are integrated by being linked (bonded) together. In addition, as the configuration where the four tanks  9  are integrated, it is also possible to adopt a configuration where, for example, the four tanks  9  are integrally formed in an integral formation or the like and the inner sections are partitioned into four chambers. In this case, each of the four chambers which are configured due to the inner section being partitioned corresponds to the liquid containing sections. In addition, the number of the liquid containers and the liquid containing sections may be a plurality (two or more) or may be just one. 
     Embodiment 2 
     In Embodiment 2, the four tanks  9  are segmented into a first group  173  and a second group  174  as shown in  FIG. 16 . In Embodiment 2, two of the tanks  9  which are a tank  9 A and a tank  9 B out of the four tanks  9  belong to the first group  173 . In addition, two of the tanks  9  which are a tank  9 C and a tank  9 D out of the four tanks  9  belong to the second group  174 . In Embodiment 2, the tank  9 A and the tank  9 B are disposed so that the liquid surface  171  of the ink inside the tanks  9  which belong to the first group  173  is lower than the rear end  46  of the nozzle formation section  44  of the nozzle surface  41  in the first posture. In addition, the tank  9 C and the tank  9 D are disposed at positions so that the liquid surface  171  of the ink inside the tanks  9  which belong to the second group  174  is higher than the front end  45  of the nozzle formation section  44  in the first posture. Furthermore, the tank  9 C and the tank  9 D are disposed so that the connection sections  115  of the tanks  9  which belong to the second group  174  are higher than the liquid surface  171  in the first posture. 
     In Embodiment 2, the tank  9 A and the tank  9 B are disposed so that the liquid surface  171  of the ink inside the tanks  9  which belong to the first group  173  is lower than the rear end  46  of the nozzle formation section  44  in the first posture. For this reason, the liquid surface  171  of the ink in the tank  9 A and the tank  9 B is positioned below the plurality of nozzles  42  ( FIG. 5 ). As such, the head of water in the tank  9 A and the tank  9 B is lower than the head of water in the printing head  38 . Due to this, it is easy to suppress the ink in the vicinity of the nozzles  42  from being pressurized by the ink which is contained in the tank  9 A and the tank  9 B. As a result, it is possible to suppress ink from flowing out from the nozzles  42 . 
     Furthermore, in Embodiment 2, the connection sections  115  of the tanks  9  are higher than the liquid surface  171  even when the liquid surface  171  inside the tanks  9  which belong to the second group  174  is higher than the nozzle formation section  44  in the first posture. That is, in Embodiment 2, the supply openings  116  ( FIG. 9 ) of the tanks  9  are higher than the liquid surface  171  even when the liquid surface  171  inside the tanks  9  which belong to the second group  174  is higher than the nozzle formation section  44  in the first posture. Due to this, it is easy for pressure due to the head of water of the ink which is contained in the tank  9 C and the tank  9 D to block the liquid supply openings  116 . For this reason, it is easy to suppress the ink in the vicinity of the nozzles  42  from being pressurized by the ink which is contained in the tank  9 C and the tank  9 D. As a result, it is possible to suppress ink from flowing out from the nozzles  42 . As a result of the above, in Embodiment 2, it is possible to reduce the possibility that ink flows out from the nozzles  42  even when the flow path for ink between the tanks  9  and the printing head  38  is not closed off in the first posture. 
     Furthermore, in Embodiment 2, the tank  9 C and the tank  9 D are disposed so that the liquid surface  171  of the ink inside the tanks  9  which belong to the second group  174  is lower than the front end  45  of the nozzle formation section  44  of the nozzle surface  41  in the second posture as shown in  FIG. 17 . In addition, the tank  9 A and the tank  9 B are disposed at positions so that the liquid surface  171  of the ink inside the tanks  9  which belong to the first group  173  is higher than the rear end  46  of the nozzle formation section  44  in the second posture. Furthermore, the tank  9 A and the tank  9 B are disposed so that the connection sections  115  of the tanks  9  which belong to the first group  173  are higher than the liquid surface  171  in the second posture. 
     In Embodiment 2, the tank  9 C and the tank  9 D are disposed so that the liquid surface  171  of the ink inside the tanks  9  which belong to the second group  174  is lower than the front end  45  of the nozzle formation section  44  in the second posture. For this reason, the liquid surface  171  of the ink in the tank  9 C and the tank  9 D is positioned below the plurality of nozzles  42  ( FIG. 5 ). As such, the head of water in the tank  9 C and the tank  9 D is lower than the head of water in the printing head  38 . Due to this, it is easy to suppress the ink in the vicinity of the nozzles  42  from being pressurized by the ink which is contained in the tank  9 C and the tank  9 D. As a result, it is possible to suppress ink from flowing out from the nozzles  42 . 
     Furthermore, in Embodiment 2, the connection sections  115  of the tanks  9  are higher than the liquid surface  171  even when the liquid surface  171  inside the tanks  9  which belong to the second group  174  is higher than the nozzle formation section  44  in the second posture. That is, in Embodiment 2, the supply openings  116  ( FIG. 9 ) of the tanks  9  are higher than the liquid surface  171  even when the liquid surface  171  inside the tanks  9  which belong to the first group  173  is higher than the nozzle formation section  44  in the second posture. Due to this, it is easy for pressure due to the head of water of the ink which is contained in the tank  9 A and the tank  9 B to block the liquid supply openings  116 . For this reason, it is easy to suppress the ink in the vicinity of the nozzles  42  from being pressurized by the ink which is contained in the tank  9 A and the tank  9 B. As a result, it is possible to suppress ink from flowing out from the nozzles  42 . As a result of the above, in Embodiment 2, it is possible to reduce the possibility that ink flows out from the nozzles  42  even when the flow path for ink between the tanks  9  and the printing head  38  is not closed off in the second posture. 
     In the aspects which are realized in the configuration in Embodiment 2 described above, the tanks  9  which belong to the first group  173  and the tanks  9  which belong to the second group  174  are disposed in a symmetrical manner so as to interpose the nozzle formation section  44  of the printing head  38 . The tanks  9  which belong to the first group  173  and the tanks  9  which belong to the second group  174  are positioned in a symmetrical manner to each other so as to interpose the nozzle formation section  44  of the printing head  38  along the Y axis. From another point of view, the tanks  9  which belong to the first group  173  and the tanks  9  which belong to the second group  174  are symmetrical with regard to a hypothetical region  175  where a region between the front end  45  and the rear end  46  of the nozzle formation section  44  extends in a direction (a direction which extends in the X axis) which intersects with the front and rear direction (a direction which extends in the Y axis) which is a direction which links the front end  45  and the rear end  46 . That is, the tanks  9  which belong to the first group  173  and the tanks  9  which belong to the second group  174  are positioned in a symmetrical manner with regard to the hypothetical region  175 . 
     By adopting this way of disposing the tanks  9  in Embodiment 2, it is possible to reduce the possibility that ink flows out from the nozzles  42  even when the flow path for ink between the tanks  9  and the printing head  38  is not closed off in both the first posture ( FIG. 16 ) and the second posture ( FIG. 17 ). In addition, by adopting this way of disposing the tanks  9 , it is possible for the tanks  9  which belong to the first group  173  and the tanks  9  which belong to the second group  174  to be disposed to line up in the front and rear direction so as to interpose the printing head  38 . Here, in Embodiment 2, the tanks  9  which belong to the first group  173  correspond to the first liquid containing section and the tanks  9  which belong to the second group  174  correspond to the second liquid containing section. In addition, in Embodiment 2, the number of the tanks  9  which belong to the first group  173  and the number of the tanks  9  which belong to the second group  174  are not limited to two and may be one or may be three or more. 
     In Embodiment 2, the four tanks  9  which configure the tank unit  5  are provided to be independent from each other. However, the configuration of the tank unit  5  is not limited to this. It is possible to adopt a configuration as the configuration of the tank unit  5  where, for example, the four tanks  9  which configure the tank unit  5  are integrated. As the configuration where the four tanks  9  are integrated, it is possible to adopt a configuration where, for example, the four tanks  9  are integrated by being linked (bonded) together. In addition, as the configuration where the four tanks  9  are integrated, it is also possible to adopt a configuration where, for example, the four tanks  9  are integrally formed in an integral formation or the like and the inner sections are partitioned into four chambers. In this case, each of the four chambers which are configured due to the inner section being partitioned corresponds to the liquid containing sections. In addition, the number of the liquid containers and the liquid containing sections may be a plurality (two or more) or may be just one. 
     In each of the embodiments described above, the liquid ejecting apparatus may be a liquid ejecting apparatus which consumes a liquid other than ink due to the liquid being ejected, discharged, or applied. Here, as states of the liquid which is discharged from the liquid ejecting apparatus as liquid droplets which are extremely small amounts, granular shapes, tear shapes, and drawn-out thread shapes are included. Here, it is sufficient if the liquid is a material which it is able to be consumed by the liquid ejecting apparatus. For example, it is sufficient if the liquid is in a state when a substance is in a liquid phase and includes liquids with high or low viscosity, sols, gels, and other fluids such as inorganic solvents, organic solvents, solutions, liquid resins, and liquid metals (molten metals). In addition, not only liquids where a substance is in one state but also particles of a functional material which are formed of solid matter such as pigments and metal particles being dissolved, dispersed, or mixed into a solvent and the like are also included. As a typical example of the liquids other than ink which is described in the embodiments described above, liquid crystals and the like can be exemplified. Here, ink encompasses various types of liquid compositions such as typical water-based inks and oil-based inks, gel inks, and hot melt inks. As detailed examples of liquid ejecting apparatuses, there are, for example, liquid ejecting apparatuses which eject liquid, which include electrode materials or materials such as colorants having been dispersed or dissolved, which are used in the manufacturing of liquid crystal displays, EL (electro luminescent) displays, field emission displays, color filters, and the like. In addition, the liquid ejecting apparatuses may be liquid ejecting apparatuses which eject bioorganic material which is used in manufacturing biochips, liquid ejecting apparatuses which are used as precision pipettes and which eject liquid samples, textile printing apparatus, micro dispensers, or the like. Furthermore, the liquid ejecting apparatuses may be liquid ejecting apparatuses which eject lubricating oil in a pin point manner in precision machinery such as clocks and cameras or liquid ejecting apparatuses which eject a transparent resin liquid such as an ultraviolet curing resin liquid onto a substrate in order to form a small semispherical lens (an optical lens) which is used in optical communication elements or the like. In addition, the liquid ejecting apparatuses may be liquid ejecting apparatuses which eject an etching liquid such as an acid or an alkali in order to carry out etching on a substrate or the like. 
     DESCRIPTION OF REFERENCE NUMERALS 
       1  LIQUID EJECTING SYSTEM,  3  PRINTER,  5  TANK UNIT,  6  FIRST CASE,  7  SECOND CASE,  9  TANK,  10  CONSTITUENT UNIT,  11  SHEET DISCHARGE SECTION,  13  FRONT SURFACE,  15  UPPER SURFACE,  17  OPERATION PANEL,  18 A POWER SOURCE BUTTON,  18 B OPERATION BUTTON,  19  SIDE SECTION,  21  WINDOW SECTION,  23  FRONT SURFACE,  25  UPPER SURFACE,  27  SIDE SECTION,  28  UPPER LIMIT MARK,  29  LOWER LIMIT MARK,  31  ATTACHMENT PIN,  32  SUPPORT FRAME,  33  ATTACHMENT PIN,  35  PRINTING SECTION,  36  SUPPLY TUBE,  37  CARRIAGE,  38  PRINTING HEAD,  39  RELAY UNIT,  41  NOZZLE SURFACE,  42  NOZZLE,  43  NOZZLE ROW,  44  NOZZLE FORMATION SECTION,  45  FRONT END,  46  REAR END,  51  TRANSPORT ROLLER,  53  MOTOR,  55  TIMING BELT,  61  CASE,  63  SHEET MEMBER,  64  BONDING SECTION,  65  CONTAINING SECTION,  67  COMMUNICATION SECTION,  68  AIR CHAMBER,  73  COMMUNICATION PATH,  80  BASE WALL,  81  FIRST WALL,  82  SECOND WALL,  82 A INNER WALL,  83  THIRD WALL,  84  FOURTH WALL,  85  FIFTH WALL,  86  SIXTH WALL,  87  SEVENTH WALL,  91  RECESS SECTION,  99  RECESS SECTION,  101  INK INTRODUCTION SECTION,  105  OVERHANG SECTION,  105 A,  105 B,  105 C,  105 D PART,  108  GROOVE,  109  RECESS SECTION,  111  EIGHT WALL,  112  NINTH WALL,  113  TENTH WALL,  114  SUPPLY SECTION,  115  CONNECTION SECTION,  116  SUPPLY OPENING,  118  AIR COMMUNICATION OPENING,  121 ,  122  COMMUNICATION OPENING,  131  RECESS SECTION,  132  OPENING,  133  SIDE WALL,  141  INK,  143  CAP,  151  FIRST FLOW PATH,  152  SECOND FLOW PATH,  153  THIRD FLOW PATH,  154  FOURTH FLOW PATH,  155  FIFTH FLOW PATH,  156  SIXTH FLOW PATH,  161  REVERSE SECTION,  162  CURVE SECTION,  163  CURVE SECTION,  164  CURVE SECTION,  165  REVERSE SECTION,  166  CURVE SECTION,  171  LIQUID SURFACE,  173  FIRST GROUP,  174  SECOND GROUP,  175  HYPOTHETICAL REGION, P PRINTING MEDIUM