Patent Publication Number: US-2023150286-A1

Title: Liquid ejecting apparatus

Description:
The present application is based on, and claims priority from JP Application Serial Number 2021-187669, filed Nov. 18, 2021, the disclosure of which is hereby incorporated by reference herein in its entirety. 
     BACKGROUND 
     1. Technical Field 
     The present disclosure relates to a liquid ejecting apparatus. 
     2. Related Art 
     JP-A-2016-175279 includes a plurality of units such as a head unit, a wiping unit, a cap unit, and an ejecting unit, and a housing for accommodating the plurality of units. In this liquid ejecting apparatus, the cap unit and the ejecting unit are configured to be replaceable through an opening formed in the housing. The cap unit becomes accessible when the ejecting unit is removed. 
     In such a liquid ejecting apparatus, when one unit is replaced, it is necessary to remove another unit. Therefore, it may take time and effort to replace the unit. 
     SUMMARY 
     According to an aspect of the present disclosure, there is provided a liquid ejecting apparatus including: a head having a nozzle that ejects a liquid; a supply unit that supplies a liquid to the head; a maintenance unit for maintaining the head; a selector unit that selects a unit to be opened to an atmosphere from the supply unit and the maintenance unit; and a housing that accommodates the supply unit, the maintenance unit, and the selector unit, in which the housing has an opening surface to which an exposure opening is open and a cover that closes the exposure opening, the exposure opening exposes the supply unit, the maintenance unit, and the selector unit, and when the exposure opening is viewed from a position facing the opening surface, the supply unit, the maintenance unit, and the selector unit are positioned not to overlap each other. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    is a front view illustrating an embodiment of a liquid ejecting apparatus. 
         FIG.  2    is a perspective view of the liquid ejecting apparatus. 
         FIG.  3    is a perspective view in which an exposure cover is removed from  FIG.  2   . 
         FIG.  4    is a perspective view of a plurality of units included in the liquid ejecting apparatus. 
         FIG.  5    is a perspective view seen from a different angle from  FIG.  4   . 
         FIG.  6    is a schematic view illustrating an inner configuration of the liquid ejecting apparatus. 
         FIG.  7    is a perspective view of a supply unit. 
         FIG.  8    is a perspective view seen from a different angle from  FIG.  7   . 
         FIG.  9    is a perspective view of a supply tray and an apparatus tray. 
         FIG.  10    is a perspective view of a maintenance unit. 
         FIG.  11    is a perspective view of a maintenance tray. 
         FIG.  12    is a perspective view of a mounting unit. 
         FIG.  13    is a perspective view of a cap unit and a wiping unit. 
         FIG.  14    is a perspective view viewed from a different angle from  FIG.  13   . 
         FIG.  15    is a view seen from a different angle from  FIGS.  13  and  14   . 
         FIG.  16    is a perspective view of a selector unit. 
         FIG.  17    is a perspective view of a first relay flow path to a fourth relay flow path. 
         FIG.  18    is a view of an exposure opening viewed from a position facing an opening surface. 
         FIG.  19    is a diagram in which the supply unit, the maintenance unit, and the selector unit are removed from  FIG.  18   . 
     
    
    
     DESCRIPTION OF EXEMPLARY EMBODIMENTS 
     Hereinafter, an embodiment of a liquid ejecting apparatus will be described with reference to the drawings. The liquid ejecting apparatus is an ink jet type printer that records images such as characters and photographs by discharging ink, which is an example of a liquid, onto a medium such as paper or cloth. 
     As illustrated in  FIG.  1   , a liquid ejecting apparatus  11  includes a housing  12 . The housing  12  will be described later. 
     The liquid ejecting apparatus  11  includes one or more accommodating sections  13 . The accommodating section  13  is configured to accommodate a medium M 1 . The accommodating section  13  is, for example, a cassette that can be drawn out from the housing  12 . 
     The liquid ejecting apparatus  11  includes a transport path  14 . The transport path  14  is a path through which the medium M 1  is transported. The transport path  14  extends within the housing  12 . In this example, the transport path  14  extends from the accommodating section  13  to eject the medium M 1  out of the housing  12 . The medium M 1  records an image in the process of being transported along the transport path  14 . 
     The liquid ejecting apparatus  11  includes a transport section  15 . The transport section  15  is configured to transport the medium M 1 . The transport section  15  has, for example, one or more rollers. The transport section  15  transports the medium M 1  accommodated in the accommodating section  13  along the transport path  14 . 
     In this example, the transport section  15  includes a transport belt  16 , a first pulley  17 , and a second pulley  18 . The transport belt  16  is wound around the first pulley  17  and the second pulley  18 . The transport belt  16  attracts the medium M 1  by, for example, electrostatic attraction. As a result, the transport belt  16  supports the medium M 1 . The first pulley  17  and the second pulley  18  are positioned along the transport path  14 . The rotation of the first pulley  17  and the second pulley  18  causes the transport belt  16  to circulate. As a result, the medium M 1  supported by the transport belt  16  is transported. 
     The liquid ejecting apparatus  11  includes a stacker  19 . The recorded medium M 1  is loaded on the stacker  19 . The stacker  19  is positioned outside the housing  12 , for example. In this example, the medium M 1  ejected to the outside of the housing  12  through the transport path  14  is loaded on the stacker  19 . 
     Next, the housing  12  will be described. 
     As illustrated in  FIG.  2   , the housing  12  has, for example, a rectangular parallelopiped shape as a whole. The housing  12  has a plurality of surfaces. The housing  12  has a drawer surface  21 . The drawer surface  21  is a surface on which the accommodating section  13  is drawn out of the housing  12 . The housing  12  has an opening surface  22 . The opening surface  22  is, for example, a surface adjacent to the drawer surface  21 . 
     The housing  12  has one or more covers. The housing  12  has an open cover  23 . The open cover  23  is positioned on the drawer surface  21 . The open cover  23  is configured to be openable and closable in, for example, the housing  12 . When the open cover  23  is opened, the inside of the housing  12  is exposed. The open cover  23  may be configured to be attachable and detachable in the housing  12 . The housing  12  has an exposure cover  24 . The exposure cover  24  is positioned on the opening surface  22 . The exposure cover  24  is configured to be attachable and detachable in the housing  12 , for example. Similarly to the open cover  23 , the exposure cover  24  may be configured to be openable and closable in the housing  12 . 
     As illustrated in  FIG.  3   , the housing  12  has an exposure opening  25 . The exposure opening  25  is open to the opening surface  22 . The exposure opening  25  is closed by the exposure cover  24 . When the exposure cover  24  is removed, the exposure opening  25  is exposed. The inside of the housing  12  is exposed through the exposure opening  25 . Specifically, a plurality of units included in the liquid ejecting apparatus  11  are exposed through the exposure opening  25 . 
     As illustrated in  FIGS.  4 ,  5 , and  6   , the liquid ejecting apparatus  11  includes a plurality of units. The liquid ejecting apparatus  11  includes, for example, a head unit  31 , a supply unit  41 , a maintenance unit  71 , a mounting unit  101 , a cap unit  111 , a wiping unit  131 , and a selector unit  141 . In  FIGS.  4  and  5   , the head unit  31  is omitted. The housing  12  accommodates these units. 
     The liquid ejecting apparatus  11  includes a plurality of fixing members. The plurality of fixing members are members that fix the plurality of units to the housing  12 , respectively. The plurality of fixing members fix each of the supply unit  41 , the maintenance unit  71 , and the selector unit  141  to the housing  12 , for example. The fixing member is, for example, a screw, a pin, or the like. Each of the plurality of units is fixed to the housing  12  by the fixing member. Specifically, the plurality of units are fixed to the sheet metal included in the housing  12  by the fixing member. The fixing member will be described as appropriate together with the description of each unit. 
     As illustrated in  FIG.  6   , the liquid ejecting apparatus  11  includes the head unit  31 . The head unit  31  is a unit that records an image on the medium M 1 . 
     The head unit  31  has a head  32 . The head  32  has one or more nozzles  33 . The head  32  ejects the liquid from the nozzle  33 . The head  32  has a nozzle surface  34 , which is a surface through which the nozzle  33  is open. The head  32  records an image on the medium M 1  by discharging a liquid from the nozzle  33  onto the medium M 1 . 
     The head  32  records an image on the medium M 1  transported by the transport section  15 . The head  32  is positioned, for example, at a position facing the transport belt  16 . In this example, the head  32  records an image on the medium M 1  supported by the transport belt  16 . 
     The head unit  31  has a first head flow path  35  and a second head flow path  36 . The first head flow path  35  and the second head flow path  36  are flow paths through which a liquid flows. The first head flow path  35  and the second head flow path  36  are coupled to the supply unit  41 . 
     The first head flow path  35  and the second head flow path  36  each have a head flow path part  37 . The head flow path part  37  may include an elastic tube, a rigid pipe, or a flow path formed by a groove carved in the plate. 
     The first head flow path  35  and the second head flow path  36  have a joint. The first head flow path  35  and the second head flow path  36  have a common head joint  38 . The head joint  38  is positioned at one end of the head flow path part  37 . The head joint  38  constitutes one end of the first head flow path  35  and one end of the second head flow path  36 . Each of the first head flow path  35  and the second head flow path  36  may individually have a joint. 
     The first head flow path  35  and the second head flow path  36  extend from the head  32 . The first head flow path  35  and the second head flow path  36  are flow paths that couple the head  32  to the supply unit  41 . The head joint  38  is positioned at the distal end of the first head flow path  35  and the second head flow path  36 . 
     The liquid ejecting apparatus  11  includes a supply unit  41 . The supply unit  41  is a unit that supplies a liquid to the head  32 . 
     The supply unit  41  has a holder  42 . The holder  42  is configured such that one or more liquid accommodating bodies  43  can be mounted. In this example, the holder  42  is configured such that four liquid accommodating bodies  43  can be mounted. The four liquid accommodating bodies  43  accommodate, for example, different liquids. The four liquid accommodating bodies  43  accommodate, for example, cyan ink, magenta ink, yellow ink, and black ink, respectively. 
     The liquid accommodating body  43  is, for example, a cartridge that accommodates a liquid. When the liquid accommodating body  43  is mounted to the holder  42 , the liquid can be supplied from the liquid accommodating body  43  to the head  32 . The liquid accommodating body  43  is replaced, for example, through the drawer surface  21 . The liquid accommodating body  43  can be replaced by opening the open cover  23 . The liquid accommodating body  43  may have an accommodating body valve  44 . In this case, the accommodating body valve  44  is open when the liquid accommodating body  43  is mounted to the holder  42 . 
     The supply unit  41  has a first tank  45 . The first tank  45  is coupled to the holder  42 . The first tank  45  is configured to store a liquid. The first tank  45  stores the liquid flowing from the liquid accommodating body  43 . The liquid flows from the liquid accommodating body  43  into the first tank  45 , for example, due to the water head difference. 
     The supply unit  41  has a second tank  46 . The second tank  46  is coupled to the first tank  45 . The second tank  46  is configured to store the liquid. The second tank  46  stores the liquid flowing from the first tank  45 . 
     The supply unit  41  has a one-way valve. The supply unit  41  has a tank valve  47  as a one-way valve. The tank valve  47  is positioned between the first tank  45  and the second tank  46 . That is, the first tank  45  and the second tank  46  are coupled via the tank valve  47 . The tank valve  47  allows the liquid to flow from the first tank  45  to the second tank  46 . The tank valve  47  regulates the flow of liquid from the second tank  46  to the first tank  45 . 
     The supply unit  41  has a first supply flow path  48 , a second supply flow path  49 , a third supply flow path  50 , a fourth supply flow path  51 , and a fifth supply flow path  52 . The first supply flow path  48  and the second supply flow path  49  are flow paths through which the liquid flows. The third supply flow path  50 , the fourth supply flow path  51 , and the fifth supply flow path  52  are flow paths through which gas flows. The first supply flow path  48  and the second supply flow path  49  are coupled to the head unit  31 . The third supply flow path  50 , the fourth supply flow path  51 , and the fifth supply flow path  52  are coupled to the selector unit  141 . 
     The first supply flow path  48  and the second supply flow path  49  each have a liquid flow path part  53 . In this example, the liquid flow path part  53  includes an elastic tube. The liquid flow path part  53  may include, for example, a rigid pipe or a flow path formed by a groove carved in the plate. 
     The first supply flow path  48  and the second supply flow path  49  have a joint. The first supply flow path  48  and the second supply flow path  49  have a common first supply joint  54 . The first supply joint  54  is positioned at one end of the liquid flow path part  53 . The first supply joint  54  constitutes one end of the first supply flow path  48  and one end of the second supply flow path  49 . Each of the first supply flow path  48  and the second supply flow path  49  may individually have a joint. 
     The first supply flow path  48  extends from the first tank  45 . The first supply flow path  48  extends from the lower part of the first tank  45 . The first supply flow path  48  is a flow path for coupling the first tank  45  to the head unit  31 . The first supply joint  54  is positioned at the distal end of the first supply flow path  48 . 
     The second supply flow path  49  extends from the second tank  46 . The second supply flow path  49  extends from the lower part of the second tank  46 . The second supply flow path  49  is a flow path for coupling the second tank  46  to the head unit  31 . The first supply joint  54  is positioned at the distal end of the second supply flow path  49 . 
     The first supply joint  54  is coupled to the head joint  38 . As a result, the first supply flow path  48  is coupled to the first head flow path  35 . The second supply flow path  49  is coupled to the second head flow path  36 . The supply unit  41  and the head unit  31  are coupled by the first supply flow path  48 , the second supply flow path  49 , the first head flow path  35 , and the second head flow path  36 . The liquid flows between the first tank  45  and the head  32  by the first supply flow path  48  and the first head flow path  35 . The liquid flows between the second tank  46  and the head  32  by the second supply flow path  49  and the second head flow path  36 . 
     The liquid flow path part  53  may be directly coupled to the head joint  38 . The head flow path part  37  may be directly coupled to the first supply joint  54 . The head joint  38  and the first supply joint  54  make it simple to couple the head unit  31  and the supply unit  41 . 
     When the head  32  performs printing, the liquid is supplied from the first tank  45  to the head  32  through the first supply flow path  48  and the first head flow path  35 , and the liquid is supplied from the second tank  46  to the head  32  through the second supply flow path  49  and the second head flow path  36 . For example, the liquid is supplied to the head  32  by the water head difference between the first tank  45  and the head  32  and the water head difference between the second tank  46  and the head  32 . By supplying the liquid through two flow paths, that is, a flow path formed by the first supply flow path  48  and the first head flow path  35 , and a flow path formed by the second supply flow path  49  and the second head flow path  36 , the amount of liquid supplied increases as compared with the case where the liquid is supplied only through any one of the flow paths. Therefore, even when the head  32  consumes a large amount of liquid, the supply of the liquid is stable. 
     When the head  32  does not perform printing, for example, the liquid circulates in the first tank  45 , the second tank  46 , and the head  32 . In this case, the liquid is sent from the second tank  46  to the head  32  through the second supply flow path  49  and the second head flow path  36 , and the liquid is sent from the head  32  to the first tank  45  through the first supply flow path  48  and the first head flow path  35 . The circulation of the liquid suppresses the sedimentation of the components contained in the liquid. 
     The third supply flow path  50 , the fourth supply flow path  51 , and the fifth supply flow path  52  each have a gas flow path part  55 . In this example, the gas flow path part  55  includes a flow path formed by a groove carved in the plate. The gas flow path part  55  may include, for example, an elastic tube or a rigid pipe. 
     The third supply flow path  50 , the fourth supply flow path  51 , and the fifth supply flow path  52  have a joint. The third supply flow path  50 , the fourth supply flow path  51 , and the fifth supply flow path  52  have a common second supply joint  56 . The second supply joint  56  is positioned at one end of the gas flow path part  55 . The second supply joint  56  constitutes one end of the third supply flow path  50 , one end of the fourth supply flow path  51 , and one end of the fifth supply flow path  52 . Each of the third supply flow path  50 , the fourth supply flow path  51 , and the fifth supply flow path  52  may individually have a joint. 
     The third supply flow path  50  extends from the first tank  45 . The third supply flow path  50  extends from the upper part of the first tank  45 . The third supply flow path  50  is a flow path for coupling the first tank  45  to the selector unit  141 . The second supply joint  56  is positioned at the distal end of the third supply flow path  50 . 
     The fourth supply flow path  51  extends from the second tank  46 . The fourth supply flow path  51  extends from the upper part of the second tank  46 . The fourth supply flow path  51  is a flow path for coupling the second tank  46  to the selector unit  141 . The second supply joint  56  is positioned at the distal end of the fourth supply flow path  51 . 
     The fifth supply flow path  52  extends from a pressurizing section  57 , which will be described later. The fifth supply flow path  52  is a flow path for coupling the pressurizing section  57  to the selector unit  141 . The second supply joint  56  is positioned at the distal end of the fifth supply flow path  52 . 
     The supply unit  41  has a pressurizing section  57 . The pressurizing section  57  is configured to pressurize the liquid in the head  32 . The pressurizing section  57  is, for example, a diaphragm pump. The pressurizing section  57  has, for example, a flexible film and a spring that presses the flexible film. 
     The pressurizing section  57  is positioned in the first supply flow path  48 . By driving, the pressurizing section  57  pressurizes the liquid in the head  32  through the first supply flow path  48  and the first head flow path  35 . As a result, the liquid is vigorously discharged from the nozzle  33 . As the liquid is vigorously discharged from the nozzle  33 , air bubbles, foreign matter, and the like in the head  32  are ejected. In this example, the vigorous discharge of liquid from the nozzle  33  by the pressurizing section  57  is called cleaning. 
     The supply unit  41  has a liquid level sensor  58 . The liquid level sensor  58  is positioned in, for example, the first tank  45 . The liquid level sensor  58  detects, for example, the liquid level of the liquid stored in the first tank  45 . As a result, the liquid ejecting apparatus  11  grasps the amount of liquid stored in the first tank  45 . 
     The supply unit  41  has a filter  59 . The filter  59  is positioned, for example, in the second tank  46 . The filter  59  is positioned at a coupling point with the second supply flow path  49  in the second tank  46 . The filter  59  collects foreign matter from the liquid flowing from the second tank  46  to the second supply flow path  49 . 
     The supply unit  41  has one or more on-off valves. The supply unit  41  has, for example, a first supply valve  60 , a second supply valve  61 , and a third supply valve  62  as on-off valves. 
     The first supply valve  60  is positioned in the first supply flow path  48 . Specifically, the first supply valve  60  is positioned between the first tank  45  and the pressurizing section  57  in the first supply flow path  48 . When the first supply valve  60  is opened, the liquid can flow through the first supply flow path  48 . 
     The second supply valve  61  is positioned in the second supply flow path  49 . When the second supply valve  61  is opened, the liquid can flow through the second supply flow path  49 . 
     The third supply valve  62  is positioned in the first tank  45 . Specifically, the third supply valve  62  is positioned at the coupling point with the holder  42  in the first tank  45 . When the third supply valve  62  is opened, the liquid can flow from the liquid accommodating body  43  to the first tank  45 . 
     The supply unit  41  has one or more moisture permeable films. The moisture permeable film is a film through which gas easily passes but a liquid does not easily pass. The supply unit  41  has a first supply film  63  and a second supply film  64  as a moisture permeable film. 
     The first supply film  63  is positioned in the third supply flow path  50 . The first supply film  63  reduces the concern that the liquid flows through the third supply flow path  50 . The first supply film  63  reduces the concern that the liquid flows from the first tank  45  to the selector unit  141 . 
     The second supply film  64  is positioned in the fourth supply flow path  51 . The second supply film  64  reduces the concern that the liquid flows through the fourth supply flow path  51 . The second supply film  64  reduces the concern that the liquid flows from the second tank  46  to the selector unit  141 . 
     As illustrated in  FIGS.  6 ,  7 ,  8 , and  9   , the supply unit  41  has a tray. The supply unit  41  has a supply tray  65 . The supply tray  65  is positioned at the lower part of the supply unit  41 . The supply tray  65  receives the liquid leaked in the supply unit  41 . The supply tray  65  receives, for example, the liquid leaked from the liquid accommodating body  43 , the liquid leaked from the first tank  45 , the liquid leaked from the second tank  46 , and the like. When the supply tray  65  receives the liquid, the concern that the liquid leaked in the supply unit  41  spreads in the housing  12  is reduced. 
     The supply unit  41  has a detecting portion. The supply unit  41  has a supply detecting portion  66 . The supply detecting portion  66  is positioned on the supply tray  65 . The supply detecting portion  66  detects the liquid received by the supply tray  65 . The supply detecting portion  66  detects the liquid by touching the liquid, for example. When the supply detecting portion  66  detects the liquid, the liquid ejecting apparatus  11  grasps that the liquid is leaking in the supply unit  41 . The liquid ejecting apparatus  11  notifies the user that the liquid is leaking in the supply unit  41  based on the detection result of the supply detecting portion  66 , for example. 
     In  FIG.  8   , eight liquid flow path parts  53  are illustrated. This is because the supply unit  41  of this example supplies four types of liquids to the head  32 . In the supply unit  41 , one first supply flow path  48  and one second supply flow path  49  are prepared for each liquid accommodating body  43  mounted on the holder  42 . 
     The liquid ejecting apparatus  11  includes a tray. The liquid ejecting apparatus  11  includes an apparatus tray  67  in addition to the supply tray  65 . The apparatus tray  67  is positioned below the supply tray  65 . The apparatus tray  67  is configured to receive the liquid received by the supply tray  65 . 
     The apparatus tray  67  has a coupling part  68 . The apparatus tray  67  is coupled to the supply tray  65  by the coupling part  68 . The coupling part  68  is a part of the apparatus tray  67  that extends toward the supply tray  65 . The coupling part  68  vertically overlaps with the supply tray  65 . The coupling part  68  receives the liquid dripping from the supply tray  65 . In this manner, the apparatus tray  67  receives the liquid received by the supply tray  65 . 
     When the liquid leaks from the liquid accommodating body  43 , there is a concern that the supply tray  65  alone is not able to receive the liquid. Therefore, in this example, when the supply tray  65  receives a predetermined amount or more of the liquid, the liquid flows from the supply tray  65  to the apparatus tray  67 . When the apparatus tray  67  receives the liquid, a concern that the liquid leaked in the supply unit  41  spreads in the housing  12  is reduced. 
     The liquid ejecting apparatus  11  includes a detecting portion. The liquid ejecting apparatus  11  includes a leakage detecting portion  69  in addition to the supply detecting portion  66 . The leakage detecting portion  69  has the same configuration as the supply detecting portion  66 , for example. The leakage detecting portion  69  is positioned on the apparatus tray  67 . The leakage detecting portion  69  detects the liquid received by the apparatus tray  67 . When the leakage detecting portion  69  detects the liquid, the liquid ejecting apparatus  11  grasps that a large amount of liquid is leaking in the supply unit  41 . The liquid ejecting apparatus  11  notifies the user that a large amount of liquid is leaking in the supply unit  41  based on the detection result of the leakage detecting portion  69 , for example. 
     As illustrated in  FIG.  7   , the liquid ejecting apparatus  11  includes a supply fixing member  70  as an example of the fixing member. The supply fixing member  70  fixes the supply unit  41  to the housing  12 . The supply fixing member  70  is attached to, for example, the supply tray  65 . As a result, the supply tray  65  is fixed to the housing  12 . When the supply fixing member  70  is removed from the supply tray  65 , the supply unit  41  can be removed from the housing  12 . The supply unit  41  is removable through the exposure opening  25 . 
     As illustrated in  FIG.  6   , the liquid ejecting apparatus  11  includes a maintenance unit  71 . The maintenance unit  71  is a unit for maintaining the head  32 . 
     The maintenance unit  71  has a moisturizer tank  72 . The moisturizer tank  72  is configured to store the liquid. The moisturizer tank  72  stores the moisturizer as a liquid. The moisturizer is used to moisturize the nozzle  33 . The moisturizer is, for example, water. 
     The maintenance unit  71  has a buffer tank  73 . The buffer tank  73  is configured to store the liquid. The buffer tank  73  stores the waste liquid as a liquid. The waste liquid is the liquid ejected from the head  32 . The waste liquid is, for example, a liquid ejected from the head  32  by cleaning. The waste liquid is, for example, a liquid ejected from the head  32  by flushing. Flushing is an operation in which the head  32  appropriately discharges a liquid in order to suppress clogging of the nozzle  33 . 
     The maintenance unit  71  has a first maintenance flow path  74 , a second maintenance flow path  75 , a third maintenance flow path  76 , a fourth maintenance flow path  77 , and a fifth maintenance flow path  78 . The first maintenance flow path  74  is a flow path through which gas flows. The second maintenance flow path  75 , the third maintenance flow path  76 , the fourth maintenance flow path  77 , and the fifth maintenance flow path  78  are mainly flow paths through which the liquid flows. 
     The first maintenance flow path  74  is coupled to the selector unit  141 . The second maintenance flow path  75 , the third maintenance flow path  76 , and the fourth maintenance flow path  77  are coupled to the cap unit  111 . The fifth maintenance flow path  78  is coupled to the wiping unit  131 . 
     The first maintenance flow path  74 , the second maintenance flow path  75 , the third maintenance flow path  76 , the fourth maintenance flow path  77 , and the fifth maintenance flow path  78  each have a maintenance flow path part  79 . In this example, the maintenance flow path part  79  includes an elastic tube. The maintenance flow path part  79  may include, for example, a rigid pipe or a flow path formed by grooves carved in the plate. 
     The first maintenance flow path  74 , the second maintenance flow path  75 , the third maintenance flow path  76 , the fourth maintenance flow path  77 , and the fifth maintenance flow path  78  have joints. The first maintenance flow path  74 , the second maintenance flow path  75 , the third maintenance flow path  76 , the fourth maintenance flow path  77 , and the fifth maintenance flow path  78  have a common maintenance joint  80 . The maintenance joint  80  is positioned at one end of the maintenance flow path part  79 . The maintenance joint  80  constitutes one end of the first maintenance flow path  74 , one end of the second maintenance flow path  75 , one end of the third maintenance flow path  76 , one end of the fourth maintenance flow path  77 , and one end of the fifth maintenance flow path  78 . The first maintenance flow path  74 , the second maintenance flow path  75 , the third maintenance flow path  76 , the fourth maintenance flow path  77 , and the fifth maintenance flow path  78  may each have different joints. 
     The first maintenance flow path  74  extends from the moisturizer tank  72 . The first maintenance flow path  74  extends from the upper part of the moisturizer tank  72 . The first maintenance flow path  74  is a flow path for coupling the moisturizer tank  72  to the selector unit  141 . The maintenance joint  80  is positioned at the distal end of the first maintenance flow path  74 . 
     The second maintenance flow path  75  extends from the moisturizer tank  72 . The second maintenance flow path  75  extends from the upper part of the moisturizer tank  72 . The second maintenance flow path  75  is a flow path for coupling the moisturizer tank  72  to the cap unit  111 . The maintenance joint  80  is positioned at the distal end of the second maintenance flow path  75 . 
     The third maintenance flow path  76  extends from the moisturizer tank  72 . The third maintenance flow path  76  extends from the upper part of the moisturizer tank  72 . The third maintenance flow path  76  is a flow path for coupling the moisturizer tank  72  to the cap unit  111 . The maintenance joint  80  is positioned at the distal end of the third maintenance flow path  76 . 
     The third maintenance flow path  76  has a branch part  81 . The branch part  81  is a part of the third maintenance flow path  76  that branches between the moisturizer tank  72  and the maintenance joint  80 . The branch part  81  is coupled to the mounting body  103  mounted on the mounting unit  101 . Therefore, the third maintenance flow path  76  is also a flow path for coupling the moisturizer tank  72  to the mounting body  103 , and is also a flow path for coupling the mounting body  103  and the cap unit  111 . 
     The fourth maintenance flow path  77  extends from the buffer tank  73 . The fourth maintenance flow path  77  extends from the upper part of the buffer tank  73 . The fourth maintenance flow path  77  is a flow path for coupling the buffer tank  73  to the cap unit  111 . The maintenance joint  80  is positioned at the distal end of the fourth maintenance flow path  77 . 
     The fifth maintenance flow path  78  is coupled to the mounting body  103  mounted on the mounting unit  101 . The fifth maintenance flow path  78  extends from the mounting body  103 . Therefore, the fifth maintenance flow path  78  is a flow path for coupling the mounting body  103  and the wiping unit  131 . That is, the mounting body  103  is coupled to the wiping unit  131  via the maintenance unit  71 . The maintenance joint  80  is positioned at the distal end of the fifth maintenance flow path  78 . 
     The fifth maintenance flow path  78  has a branch part  82 . The branch part  82  is a part of the fifth maintenance flow path  78  that branches between the mounting body  103  and the maintenance joint  80 . The branch part  82  is coupled to the buffer tank  73 . Therefore, the fifth maintenance flow path  78  is also a flow path for coupling the buffer tank  73  to the mounting body  103 , and is also a flow path for coupling the buffer tank  73  to the wiping unit  131 . 
     The maintenance unit  71  has a moisturizer amount sensor  83 . The moisturizer amount sensor  83  is positioned in, for example, the moisturizer tank  72 . The moisturizer amount sensor  83  detects, for example, the liquid level of the liquid stored in the moisturizer tank  72 . As a result, the liquid ejecting apparatus  11  grasps the amount of the moisturizer stored in the moisturizer tank  72 . 
     The maintenance unit  71  has a moisture permeable film. The maintenance unit  71  has a maintenance film  84  as a moisture permeable film. The maintenance film  84  is positioned, for example, in the moisturizer tank  72 . The maintenance film  84  is positioned at a coupling point with the first maintenance flow path  74  in the moisturizer tank  72 . The maintenance film  84  reduces the concern that the moisturizer flows through the first maintenance flow path  74 . The maintenance film  84  reduces the concern that the moisturizer flows from the moisturizer tank  72  to the selector unit  141 . 
     The maintenance unit  71  has a plurality of valves. The maintenance unit  71  has, for example, one or more on-off valves and one or more one-way valves. In this example, the maintenance unit  71  has a first maintenance valve  85  as an on-off valve. The maintenance unit  71  has a second maintenance valve  86 , a third maintenance valve  87 , and a fourth maintenance valve  88  as one-way valves. 
     The first maintenance valve  85  is positioned, for example, in the third maintenance flow path  76 . The first maintenance valve  85  is positioned at the branch part  81  in the third maintenance flow path  76 . When the first maintenance valve  85  is opened, the moisturizer can flow through the branch part  81 . 
     The second maintenance valve  86  is positioned, for example, in the second maintenance flow path  75 . The second maintenance valve  86  allows the moisturizer to flow from the cap unit  111  toward the moisturizer tank  72  through the second maintenance flow path  75 . The second maintenance valve  86  regulates the flow of the moisturizer from the moisturizer tank  72  toward the cap unit  111  through the second maintenance flow path  75 . 
     The third maintenance valve  87  is positioned, for example, in the third maintenance flow path  76 . The third maintenance valve  87  is positioned at a part different from the branch part  81  in the third maintenance flow path  76 . The third maintenance valve  87  is positioned between the branch position of the branch part  81  and the moisturizer tank  72  in the third maintenance flow path  76 . The third maintenance valve  87  allows the moisturizer to flow from the moisturizer tank  72  toward the branch position of the branch part  81  through the third maintenance flow path  76 . The third maintenance valve  87  regulates the flow of the moisturizer from the branch position of the branch part  81  toward the moisturizer tank  72  through the third maintenance flow path  76 . 
     The fourth maintenance valve  88  is positioned, for example, in the third maintenance flow path  76 . The fourth maintenance valve  88  is positioned at the branch part  81  in the third maintenance flow path  76 . The fourth maintenance valve  88  is positioned between the mounting body  103  and the first maintenance valve  85  at the branch part  81 . The fourth maintenance valve  88  allows the moisturizer to flow through the third maintenance flow path  76  from the mounting body  103  toward the branch position of the branch part  81 . The fourth maintenance valve  88  regulates the flow of the moisturizer from the branch position of the branch part  81  toward the mounting body  103  through the third maintenance flow path  76 . 
     The maintenance unit  71  has one or more suction pumps. The maintenance unit  71  has a first maintenance pump  89 , a second maintenance pump  90 , and a third maintenance pump  91  as suction pumps. 
     The first maintenance pump  89  is positioned in the third maintenance flow path  76 . The first maintenance pump  89  is positioned at a part different from the branch part  81  in the third maintenance flow path  76 . The first maintenance pump  89  is positioned between the branch position of the branch part  81  and the maintenance joint  80 . By driving the first maintenance pump  89 , the moisturizer is sent from the moisturizer tank  72  or the mounting body  103  to the cap unit  111 . 
     The second maintenance pump  90  is positioned in the fifth maintenance flow path  78 . The second maintenance pump  90  is positioned at the branch position of the branch part  82  in the fifth maintenance flow path  78 . By driving the second maintenance pump  90 , the waste liquid is sent from the wiping unit  131  or the buffer tank  73  to the mounting body  103 . 
     The third maintenance pump  91  is coupled to the buffer tank  73 . In this example, two third maintenance pumps  91  are coupled to the buffer tank  73 . The third maintenance pump  91  performs suctioning inside the buffer tank  73 . As a result, the waste liquid is sent from the cap unit  111  to the buffer tank  73  through the fourth maintenance flow path  77 . 
     As illustrated in  FIGS.  6 ,  10 , and  11   , the maintenance unit  71  has a tray. The maintenance unit  71  has a maintenance tray  92 . The maintenance tray  92  is positioned at the lower part of the maintenance unit  71 . 
     The maintenance tray  92  receives the liquid leaked in the maintenance unit  71 , that is, the waste liquid or the moisturizer. The maintenance tray  92  receives, for example, the waste liquid leaked from the buffer tank  73 . The maintenance tray  92  receives, for example, the moisturizer leaked from the moisturizer tank  72 . The maintenance tray  92  reduces the concern that the leaked waste liquid and the leaked moisturizer in the maintenance unit  71  spread inside the housing  12 . 
     The maintenance unit  71  has a detecting portion. The maintenance unit  71  has a maintenance detecting portion  93 . The maintenance detecting portion  93  is positioned on the maintenance tray  92 . 
     The maintenance detecting portion  93  detects the liquid received by the maintenance tray  92 , that is, the waste liquid or the moisturizer. The maintenance detecting portion  93  has, for example, the same configuration as the supply detecting portion  66  and the leakage detecting portion  69 . When the maintenance detecting portion  93  detects the waste liquid or the moisturizer, the liquid ejecting apparatus  11  grasps that the waste liquid or the moisturizer is leaking in the maintenance unit  71 . The liquid ejecting apparatus  11  notifies the user that the waste liquid or the moisturizer is leaking in the maintenance unit  71 , for example, based on the detection result of the maintenance detecting portion  93 . 
     In the maintenance unit  71 , the third maintenance pump  91  may be exhausted toward the maintenance tray  92 . In this case, when the amount of waste liquid stored in the buffer tank  73  approaches the maximum capacity of the buffer tank  73 , the waste liquid is ejected to the maintenance tray  92  through the third maintenance pump  91 . When the maintenance detecting portion  93  detects this waste liquid, the liquid ejecting apparatus  11  can grasp that the amount of the waste liquid stored in the buffer tank  73  has approached the maximum capacity of the buffer tank  73 . 
     As illustrated in  FIG.  10   , the maintenance unit  71  has a coupling body  94 . The coupling body  94  is a part coupled to the mounting body  103 . The coupling body  94  constitutes the third maintenance flow path  76  and the fifth maintenance flow path  78 . 
     The coupling body  94  has a coupling needle  95  and a supply needle  96 . The coupling needle  95  and the supply needle  96  are coupled to the mounting body  103 . The coupling needle  95  constitutes the fifth maintenance flow path  78 . The supply needle  96  constitutes the third maintenance flow path  76 . Specifically, the supply needle  96  constitutes the branch part  81 . 
     The liquid ejecting apparatus  11  includes a maintenance fixing member  97  as an example of the fixing member. The maintenance fixing member  97  fixes the maintenance unit  71  to the housing  12 . The maintenance fixing member  97  is attached to, for example, the maintenance tray  92 . As a result, the maintenance tray  92  is fixed to the housing  12 . When the maintenance fixing member  97  is removed from the maintenance unit  71 , the maintenance unit  71  can be removed from the housing  12 . The maintenance unit  71  is removable through the exposure opening  25 . 
     As illustrated in  FIG.  6   , the liquid ejecting apparatus  11  includes the mounting unit  101 . The mounting unit  101  is a unit configured to be able to mount the mounting body  103  that accommodates a liquid ejected as waste liquid from the head  32 . In this example, the mounting body  103  accommodates not only the waste liquid but also the moisturizer. 
     The mounting unit  101  has a mounting section  102 . The mounting section  102  is configured such that the mounting body  103  can be mounted. The mounting body  103  is mounted on the mounting section  102  by being inserted into the mounting section  102 . 
     The mounting body  103  is coupled to the coupling needle  95  and the supply needle  96  by being mounted on the mounting section  102 . The mounting body  103  is replaced, for example, through the drawer surface  21 . The mounting body  103  can be replaced by opening the open cover  23 . 
     The mounting body  103  has a waste liquid chamber  104  and a moisturizer chamber  105 . The waste liquid chamber  104  is a space for accommodating the waste liquid. The waste liquid chamber  104  is coupled to the coupling needle  95 . That is, the waste liquid chamber  104  is coupled to the fifth maintenance flow path  78 . The moisturizer chamber  105  is a space for accommodating the moisturizer. In this example, the moisturizer chamber  105  accommodates a moisturizer pack  106 . The moisturizer pack  106  is a pack that accommodates the moisturizer. The moisturizer pack  106  is coupled to the supply needle  96 . That is, the moisturizer pack  106  is coupled to the third maintenance flow path  76 . 
     As illustrated in  FIG.  12   , the liquid ejecting apparatus  11  includes a mounting fixing member  107  as an example of the fixing member. The mounting fixing member  107  fixes the mounting unit  101  to the housing  12 . The mounting fixing member  107  is attached to, for example, the mounting section  102 . As a result, the mounting unit  101  is fixed to the housing  12 . When the mounting fixing member  107  is removed from the mounting unit  101 , the mounting unit  101  can be removed from the housing  12 . The mounting unit  101  is removable through the exposure opening  25 . 
     As illustrated in  FIG.  6   , the liquid ejecting apparatus  11  includes a cap unit  111 . The cap unit  111  is a unit for maintaining the head  32 . 
     The cap unit  111  has one or more caps  112 . The cap  112  comes into contact with the head  32  to cover the nozzle  33 . The cap  112  covers the nozzle  33  by coming into contact with the nozzle surface  34 . In this example, covering the nozzle  33  with the cap  112  is called capping. 
     The cap  112  moisturizes the nozzle  33  by capping. Further, the cap  112  receives the waste liquid from the head  32 . The cap  112  receives, for example, waste liquid by cleaning and waste liquid by flushing. As a result, the cap  112  maintains the head  32 . 
     The cap  112  can be displaced to a position in contact with the head  32  and a position away from the head  32 . When the head  32  does not perform printing, the cap  112  is displaced to a position in contact with the head  32 . The position in contact with the head  32  is, for example, a position between the head  32  and the transport belt  16 . When the head  32  performs printing, the cap  112  is displaced away from the head  32 . 
     The cap unit  111  has a moisture permeable film. The cap unit  111  has a cap film  113  as a moisture permeable film. The cap film  113  is positioned within the cap  112 . The cap film  113  partitions the inside of the cap  112  into a waste liquid space  114  and a moisturizer space  115 . 
     The waste liquid space  114  is a space for receiving the waste liquid from the head  32 . The moisturizer space  115  is a space for holding the moisturizer. The nozzle  33  is moisturized by the moisturizer vaporized in the moisturizer space  115  filling the waste liquid space  114  through the cap film  113 . 
     The cap unit  111  has a first cap flow path  116 , a second cap flow path  117 , and a third cap flow path  118 . The first cap flow path  116 , the second cap flow path  117 , and the third cap flow path  118  are mainly flow paths through which a liquid flows. The first cap flow path  116 , the second cap flow path  117 , and the third cap flow path  118  are coupled to the maintenance unit  71 . 
     The first cap flow path  116 , the second cap flow path  117 , and the third cap flow path  118  each have a cap flow path part  119 . The cap flow path part  119  includes, for example, an elastic tube. The cap flow path part  119  may include a rigid pipe or may include a flow path formed by a groove carved in the plate. 
     The first cap flow path  116  extends from the cap  112 . Specifically, the first cap flow path  116  extends from the waste liquid space  114 . The first cap flow path  116  is a flow path for coupling the cap  112  to the maintenance unit  71 . 
     The second cap flow path  117  extends from the cap  112 . Specifically, the second cap flow path  117  extends from the moisturizer space  115 . The second cap flow path  117  is a flow path for coupling the cap  112  to the maintenance unit  71 . 
     The third cap flow path  118  extends from the cap  112 . Specifically, the third cap flow path  118  extends from the moisturizer space  115 . The third cap flow path  118  is a flow path for coupling the cap  112  to the maintenance unit  71 . 
     As illustrated in  FIGS.  13 ,  14 , and  15   , the cap unit  111  has an ejecting member  121 . The ejecting member  121  is a member that ejects the leaked liquid in the cap unit  111 , that is, the leaked waste liquid or the leaked moisturizer to the maintenance tray  92 . The ejecting member  121  is, for example, a frame extending from the cap  112  toward the maintenance tray  92 . The leaked waste liquid or the leaked moisturizer in the cap unit  111  flows from the cap unit  111  to the maintenance tray  92  by flowing along the ejecting member  121 . 
     As illustrated in  FIG.  6   , the liquid ejecting apparatus  11  includes the wiping unit  131 . The wiping unit  131  is a unit for maintaining the head  32 . 
     The wiping unit  131  has a wiping section  132 . The wiping section  132  wipes the nozzle surface  34  by coming into contact with the nozzle surface  34 . As a result, the wiping section  132  removes the liquid adhering to the nozzle surface  34 . The wiping section  132  is, for example, a rubber blade. The wiping section  132  wipes the nozzle surface  34  by moving in a contact state with the nozzle surface  34 . In this example, wiping the nozzle surface  34  by the wiping section  132  is called wiping. 
     The wiping unit  131  has a cleaner  133 . The cleaner  133  is a member for cleaning the wiping section  132 . When the wiping section  132  performs wiping, the liquid adheres to the wiping section  132 . The cleaner  133  collects the liquid adhering to the wiping section  132 . As a result, the wiping section  132  can be wiped in a state where the liquid does not adhere to itself. The cleaner  133  stores the liquid as a waste liquid by collecting the liquid from the wiping section  132 , for example. 
     The wiping unit  131  has a wiping flow path  134 . The wiping flow path  134  is a flow path through which a liquid mainly flows. The wiping flow path  134  is coupled to the maintenance unit  71 . 
     The wiping flow path  134  has a wiping flow path part  135 . The wiping flow path part  135  includes, for example, an elastic tube. The wiping flow path part  135  may include a rigid pipe or may include a flow path formed by a groove carved in the plate. 
     The wiping flow path  134  extends from, for example, the wiping section  132 . The wiping flow path  134  is a flow path for coupling the wiping section  132  to the maintenance unit  71 . The waste liquid wiped by the wiping section  132  flows through the wiping flow path  134 . The wiping flow path  134  may extend from the cleaner  133 . In this case, the waste liquid collected by the cleaner  133  flows through the wiping flow path  134 . 
     As illustrated in  FIGS.  13 ,  14 , and  15   , the wiping unit  131  has a guide member  136 . The guide member  136  is a member that guides the liquid leaked from the wiping unit  131  to the maintenance tray  92 . The liquid leaked in the wiping unit  131  is, for example, a liquid that flowed down from the wiping section  132 , a liquid that was scattered by the wiping section  132  wiping the nozzle surface  34 , a liquid that leaked from the cleaner  133 , and the like. The guide member  136  is, for example, a frame extending from the cleaner  133  and the wiping section  132  toward the maintenance tray  92 . The liquid leaked in the wiping unit  131  flows from the wiping unit  131  to the maintenance tray  92  by flowing along the guide member  136 . 
     As illustrated in  FIG.  6   , the liquid ejecting apparatus  11  includes the selector unit  141 . The selector unit  141  is a unit configured such that a unit to be opened to the atmosphere can be selected from the supply unit  41  and the maintenance unit  71 . That is, the selector unit  141  can open the supply unit  41  to the atmosphere and the maintenance unit  71  to the atmosphere. 
     The selector unit  141  has a selector valve  142 . The selector valve  142  is coupled to the supply unit  41  and the maintenance unit  71 . By opening and closing the selector valve  142 , a unit to be opened to the atmosphere is selected from the supply unit  41  and the maintenance unit  71 . 
     The selector unit  141  has a decompression pump  143 . The decompression pump  143  decompresses other units coupled to the selector unit  141 . For example, the decompression pump  143  decompresses the supply unit  41 . For example, the decompression pump  143  decompresses the maintenance unit  71 . 
     The selector unit  141  has a pressure sensor  144 . The pressure sensor  144  detects the pressure in the selector valve  142 . The selector unit  141  controls the selector valve  142  and the decompression pump  143  based on the detection result of the pressure sensor  144 . 
     As illustrated in  FIG.  16   , the selector unit  141  has a support frame  145  that supports the selector valve  142 . In this example, the support frame  145  is equipped with the selector valve  142  and the decompression pump  143 . 
     The liquid ejecting apparatus  11  includes a selector fixing member  146  as an example of the fixing member. The selector fixing member  146  fixes the selector unit  141  to the housing  12 . The selector fixing member  146  is attached to, for example, the support frame  145 . As a result, the selector unit  141  is fixed to the housing  12 . When the selector fixing member  146  is removed, the selector unit  141  can be removed from the housing  12 . The selector unit  141  is removable through the exposure opening  25 . 
     As illustrated in  FIG.  6   , the liquid ejecting apparatus  11  includes one or more coupling flow paths. The coupling flow path is a flow path for coupling two units among the supply unit  41 , the maintenance unit  71 , and the selector unit  141 . In this example, the coupling flow path includes a flow path for coupling the supply unit  41  and the selector unit  141 , and a flow path for coupling the maintenance unit  71  and the selector unit  141 . 
     The liquid ejecting apparatus  11  includes a first coupling flow path  151 , a second coupling flow path  152 , a third coupling flow path  153 , and a fourth coupling flow path  154 . The first coupling flow path  151 , the second coupling flow path  152 , the third coupling flow path  153 , and the fourth coupling flow path  154  are flow paths through which gas flows. The first coupling flow path  151 , the second coupling flow path  152 , the third coupling flow path  153 , and the fourth coupling flow path  154  are coupled to the selector valve  142 . The first coupling flow path  151 , the second coupling flow path  152 , the third coupling flow path  153 , and the fourth coupling flow path  154  can be opened and closed by the selector valve  142 . 
     The first coupling flow path  151  is a flow path for coupling the selector unit  141  and the supply unit  41 . The second coupling flow path  152  is a flow path for coupling the selector unit  141  and the supply unit  41 . The third coupling flow path  153  is a flow path for coupling the selector unit  141  and the supply unit  41 . The fourth coupling flow path  154  is a flow path for coupling the selector unit  141  and the maintenance unit  71 . The selector unit  141  opens the supply unit  41 , the maintenance unit  71 , or both to the atmosphere through the first coupling flow path  151 , the second coupling flow path  152 , the third coupling flow path  153 , and the fourth coupling flow path  154 . 
     The first coupling flow path  151 , the second coupling flow path  152 , and the third coupling flow path  153  each have a first flow path part  155 . The first flow path part  155  includes, for example, an elastic tube. The first flow path part  155  may include a rigid pipe or may include a flow path formed by a groove carved in the plate. 
     The first coupling flow path  151 , the second coupling flow path  152 , and the third coupling flow path  153  have a joint. The first coupling flow path  151 , the second coupling flow path  152 , and the third coupling flow path  153  have a common first coupling joint  156 . The first coupling joint  156  is positioned at one end of the first flow path part  155 . The first coupling joint  156  constitutes one end of the first coupling flow path  151 , one end of the second coupling flow path  152 , and one end of the third coupling flow path  153 . The first coupling flow path  151 , the second coupling flow path  152 , and the third coupling flow path  153  may have different joints. 
     The first coupling joint  156  is coupled to the second supply joint  56 . As a result, the first coupling flow path  151  is coupled to the third supply flow path  50 . The second coupling flow path  152  is coupled to the fourth supply flow path  51 . The third coupling flow path  153  is coupled to the fifth supply flow path  52 . Therefore, the first coupling flow path  151  couples the selector valve  142  and the first tank  45 . The second coupling flow path  152  couples the selector valve  142  and the second tank  46 . The third coupling flow path  153  couples the selector valve  142  and the pressurizing section  57 . 
     The first flow path part  155  may be directly coupled to the second supply joint  56 . The gas flow path part  55  may be directly coupled to the first coupling joint  156 . The second supply joint  56  and the first coupling joint  156  make it simple to couple the first coupling flow path  151 , the second coupling flow path  152 , and the third coupling flow path  153  to the supply unit  41 . That is, the second supply joint  56  and the first coupling joint  156  make it simple to couple the supply unit  41  and the selector unit  141 . 
     When the first coupling flow path  151  is opened by the selector valve  142 , the first tank  45  is opened to the atmosphere. When the second coupling flow path  152  is opened by the selector valve  142 , the second tank  46  is opened to the atmosphere. When the third coupling flow path  153  is opened by the selector valve  142 , the pressurizing section  57  is opened to the atmosphere. 
     When the decompression pump  143  is driven, the pressure is reduced in the first tank  45  through the first coupling flow path  151 . As a result, for example, the liquid flows from the head  32  to the first tank  45  through the first supply flow path  48 . When the decompression pump  143  is driven, the pressure is reduced in the second tank  46  through the second coupling flow path  152 . As a result, for example, the liquid flows from the first tank  45  to the second tank  46  through the tank valve  47 . When the decompression pump  143  is driven, the pressure is reduced in the pressurizing section  57  through the third coupling flow path  153 . After that, when the pressurizing section  57  is opened to the atmosphere through the third coupling flow path  153 , the pressurizing section  57  pressurizes the liquid in the head  32 . In this manner, the decompression pump  143  drives the pressurizing section  57 . 
     The fourth coupling flow path  154  has a second flow path part  157 . The second flow path part  157  includes, for example, an elastic tube. The second flow path part  157  may include a rigid pipe or may include a flow path formed by a groove carved in the plate. 
     The fourth coupling flow path  154  has a joint. The fourth coupling flow path  154  has a second coupling joint  158 . The second coupling joint  158  is positioned at one end of the second flow path part  157 . The second coupling joint  158  constitutes one end of the fourth coupling flow path  154 . 
     The second coupling joint  158  is coupled to the maintenance joint  80 . As a result, the fourth coupling flow path  154  is coupled to the first maintenance flow path  74 . Therefore, the fourth coupling flow path  154  couples the selector valve  142  and the moisturizer tank  72 . 
     The second flow path part  157  may be directly coupled to the maintenance joint  80 . The maintenance flow path part  79  may be directly coupled to the second coupling joint  158 . The maintenance joint  80  and the second coupling joint  158  make it simple to couple the fourth coupling flow path  154  to the maintenance unit  71 . That is, the maintenance joint  80  and the second coupling joint  158  make it simple to couple the maintenance unit  71  and the selector unit  141 . 
     When the fourth coupling flow path  154  is opened by the selector valve  142 , the moisturizer tank  72  is opened to the atmosphere. When the decompression pump  143  is driven, the pressure is reduced in the moisturizer tank  72  through the fourth coupling flow path  154 . As a result, for example, the moisturizer flows from the cap  112  to the moisturizer tank  72  through the second maintenance flow path  75 . 
     The first coupling flow path  151 , the second coupling flow path  152 , the third coupling flow path  153 , and the fourth coupling flow path  154  are not limited to one end, and may have joints at both ends thereof. In this case, the coupling of the first coupling flow path  151 , the second coupling flow path  152 , the third coupling flow path  153 , and the fourth coupling flow path  154  to the selector unit  141  becomes simple. Accordingly, the coupling between the selector unit  141  and other units becomes simple. 
     The liquid ejecting apparatus  11  includes a first relay flow path  161 , a second relay flow path  162 , a third relay flow path  163 , and a fourth relay flow path  164 . The first relay flow path  161 , the second relay flow path  162 , the third relay flow path  163 , and the fourth relay flow path  164  are mainly flow paths through which the liquid flows. 
     The first relay flow path  161  is a flow path for coupling the maintenance unit  71  and the wiping unit  131 . The second relay flow path  162 , the third relay flow path  163 , and the fourth relay flow path  164  are flow paths for coupling the maintenance unit  71  and the cap unit  111 . 
     The first relay flow path  161 , the second relay flow path  162 , the third relay flow path  163 , and the fourth relay flow path  164  each have a relay flow path part  165 . The relay flow path part  165  includes, for example, an elastic tube. The relay flow path part  165  may include a rigid pipe or may include a flow path formed by a groove carved in the plate. 
     The first relay flow path  161 , the second relay flow path  162 , the third relay flow path  163 , and the fourth relay flow path  164  have joints. The first relay flow path  161 , the second relay flow path  162 , the third relay flow path  163 , and the fourth relay flow path  164  have joints at both ends thereof. 
     The first relay flow path  161 , the second relay flow path  162 , the third relay flow path  163 , and the fourth relay flow path  164  have a common second coupling joint  158 . That is, the first relay flow path  161 , the second relay flow path  162 , the third relay flow path  163 , and the fourth relay flow path  164  share the fourth coupling flow path  154  and the second coupling joint  158 . The first relay flow path  161 , the second relay flow path  162 , the third relay flow path  163 , and the fourth relay flow path  164  have a common relay joint  166 . 
     The second coupling joint  158  is positioned at one end of the first relay flow path  161  and the relay joint  166  is positioned at the other end of the first relay flow path  161 . The second coupling joint  158  is positioned at one end of the second relay flow path  162 , and the relay joint  166  is positioned at the other end of the second relay flow path  162 . The second coupling joint  158  is positioned at one end of the third relay flow path  163 , and the relay joint  166  is positioned at the other end of the third relay flow path  163 . The second coupling joint  158  is positioned at one end of the fourth relay flow path  164 , and the relay joint  166  is positioned at the other end of the fourth relay flow path  164 . 
     The second coupling joint  158  constitutes one end of the first relay flow path  161 , one end of the second relay flow path  162 , one end of the third relay flow path  163 , and one end of the fourth relay flow path  164 . The relay joint  166  constitutes the other end of the first relay flow path  161 , the other end of the second relay flow path  162 , the other end of the third relay flow path  163 , and the other end of the fourth relay flow path  164 . The first relay flow path  161 , the second relay flow path  162 , the third relay flow path  163 , and the fourth relay flow path  164  may have different joints, respectively. 
     The second coupling joint  158  is coupled to the maintenance joint  80 . As a result, the first relay flow path  161  is coupled to the fifth maintenance flow path  78 . The second relay flow path  162  is coupled to the fourth maintenance flow path  77 . The third relay flow path  163  is coupled to the second maintenance flow path  75 . The fourth relay flow path  164  is coupled to the third maintenance flow path  76 . 
     The first cap flow path  116 , the second cap flow path  117 , the third cap flow path  118 , and the wiping flow path  134  are coupled to the relay joint  166 . As a result, the first relay flow path  161  is coupled to the wiping flow path  134 . The second relay flow path  162  is coupled to the first cap flow path  116 . The third relay flow path  163  is coupled to the second cap flow path  117 . The fourth relay flow path  164  is coupled to the third cap flow path  118 . 
     The first relay flow path  161  relays between the fifth maintenance flow path  78  and the wiping flow path  134 . That is, the first relay flow path  161  couples the maintenance unit  71  and the wiping unit  131 . The maintenance unit  71  and the wiping unit  131  are coupled via the first relay flow path  161 . The first relay flow path  161  couples the wiping section  132  and the mounting body  103 . 
     The second relay flow path  162  relays between the fourth maintenance flow path  77  and the first cap flow path  116 . That is, the second relay flow path  162  couples the maintenance unit  71  and the cap unit  111 . The maintenance unit  71  and the cap unit  111  are coupled via the second relay flow path  162 . The second relay flow path  162  couples the cap  112  and the buffer tank  73 . 
     The third relay flow path  163  relays between the second maintenance flow path  75  and the second cap flow path  117 . That is, the third relay flow path  163  couples the maintenance unit  71  and the cap unit  111 . The maintenance unit  71  and the cap unit  111  are coupled via the third relay flow path  163 . The third relay flow path  163  couples the cap  112  and the moisturizer tank  72 . 
     The fourth relay flow path  164  relays between the third maintenance flow path  76  and the third cap flow path  118 . That is, the fourth relay flow path  164  couples the maintenance unit  71  and the cap unit  111 . The maintenance unit  71  and the cap unit  111  are coupled via the fourth relay flow path  164 . The fourth relay flow path  164  couples the cap  112  and the moisturizer tank  72 . The fourth relay flow path  164  couples the cap  112  and the mounting body  103 . 
     The relay flow path part  165  may be directly coupled to the maintenance joint  80 . The maintenance flow path part  79  may be directly coupled to the second coupling joint  158 . The maintenance joint  80  and the second coupling joint  158  make it simple to attach and detach the maintenance unit  71  and the selector unit  141 . Further, the maintenance joint  80  and the second coupling joint  158  make it simple to attach and detach the maintenance unit  71  and the cap unit  111 . Further, the maintenance joint  80  and the second coupling joint  158  make it simple to attach and detach the maintenance unit  71  and the wiping unit  131 . 
     The cap flow path part  119  may be directly coupled to the maintenance joint  80 . That is, the maintenance unit  71  may be directly coupled to the cap unit  111 . Further, the wiping flow path part  135  may be directly coupled to the maintenance joint  80 . That is, the maintenance unit  71  may be directly coupled to the wiping unit  131 . In such a case, the relay flow path becomes unnecessary. 
     As illustrated in  FIG.  16   , in this example, two second coupling flow paths  152  extend from the selector valve  142 . This is because one second coupling flow path  152  corresponds to two liquid accommodating bodies  43 . That is, one second coupling flow path  152  is coupled to two second tanks  46 . The first coupling flow path  151  is coupled to four first tanks  45 . 
     As illustrated in  FIG.  17   , in this example, the second coupling joint  158  and the relay joint  166  are coupled by six relay flow path parts  165 . Among the six relay flow path parts  165 , three relay flow path parts  165  each constitute a second relay flow path  162 . That is, in this example, the selector unit  141  has three second relay flow paths  162 . Therefore, in this example, the cap unit  111  has three first cap flow paths  116 . The three first cap flow paths  116  may be coupled to one cap  112  or may be coupled to different caps  112 . The remaining three relay flow path parts  165  constitute a first relay flow path  161 , a third relay flow path  163 , and a fourth relay flow path  164 , respectively. 
     Next, replacement of the unit will be described. 
     The supply unit  41 , the maintenance unit  71 , and the selector unit  141  can be replaced through the exposure opening  25 . That is, the supply unit  41 , the maintenance unit  71 , and the selector unit  141  can be replaced through one opening. By integrating the openings, from which the supply unit  41 , the maintenance unit  71 , and the selector unit  141  are taken out, into the exposure opening  25 , the work efficiency of the worker who replaces the unit is improved. In this example, in addition to the supply unit  41 , the maintenance unit  71 , and the selector unit  141 , the mounting unit  101  is also replaceable through the exposure opening  25 . The worker replaces the unit by taking the unit out of the exposure opening  25  and then inserting a new unit through the exposure opening  25 . 
     As illustrated in  FIG.  18   , the supply unit  41 , the maintenance unit  71 , and the selector unit  141  are exposed from the exposure opening  25 . When the exposure opening  25  is viewed from a position facing the opening surface  22 , the supply unit  41  is arranged side by side with the selector unit  141 . The supply unit  41  is arranged side by side with the maintenance unit  71  and is positioned above the maintenance unit  71 . The maintenance unit  71  is positioned below the selector unit  141 . 
     When the exposure opening  25  is viewed from a position facing the opening surface  22 , the supply unit  41 , the maintenance unit  71 , and the selector unit  141  are positioned not to overlap each other. Therefore, when one of the supply unit  41 , the maintenance unit  71 , and the selector unit  141  is taken out of the exposure opening  25 , one unit does not interfere with the other unit. For example, when the supply unit  41  is taken out of the exposure opening  25 , the supply unit  41  does not interfere with the maintenance unit  71  and the selector unit  141 . Accordingly, it is not necessary to take out another unit in order to take out one unit. Therefore, each of the supply unit  41 , the maintenance unit  71 , and the selector unit  141  can be individually taken out of the exposure opening  25 . Therefore, the supply unit  41 , the maintenance unit  71 , and the selector unit  141  can be easily replaced. 
     The mounting unit  101  is exposed from the exposure opening  25 . When the exposure opening  25  is viewed from a position facing the opening surface  22 , the mounting unit  101  is arranged side by side with the maintenance unit  71 . The mounting unit  101  is positioned below the supply unit  41 . 
     When the exposure opening  25  is viewed from a position facing the opening surface  22 , the mounting unit  101  is positioned not to overlap the supply unit  41 , the maintenance unit  71 , and the selector unit  141 . Therefore, when the mounting unit  101  is taken out of the exposure opening  25 , the mounting unit  101  does not interfere with the supply unit  41 , the maintenance unit  71 , and the selector unit  141 . Therefore, each of the supply unit  41 , the maintenance unit  71 , the selector unit  141 , and the mounting unit  101  can be individually taken out of the exposure opening  25 . Therefore, in addition to the supply unit  41 , the maintenance unit  71 , and the selector unit  141 , the mounting unit  101  can be easily replaced. 
     One end of the coupling flow path is exposed from the exposure opening  25 . When the exposure opening  25  is viewed from a position facing the opening surface  22 , one end of the coupling flow path is exposed. For example, one end of the first coupling flow path  151 , one end of the second coupling flow path  152 , and one end of the third coupling flow path  153  are exposed from the exposure opening  25 . Therefore, it is easy to access one end of the first coupling flow path  151 , one end of the second coupling flow path  152 , and one end of the third coupling flow path  153  from the exposure opening  25 . As a result, the first coupling flow path  151 , the second coupling flow path  152 , and the third coupling flow path  153  can be easily removed from the supply unit  41  or the selector unit  141 . 
     The first coupling flow path  151 , the second coupling flow path  152 , and the third coupling flow path  153  include the elastic first flow path part  155 . Therefore, the first flow path part  155  can be deformed. As a result, when one unit is taken out of the exposure opening  25 , the first flow path part  155  can be deformed such that the first coupling flow path  151 , the second coupling flow path  152 , and the third coupling flow path  153  do not interfere with the unit. For example, when the supply unit  41  or the selector unit  141  is taken out of the exposure opening  25 , the first flow path part  155  can be deformed such that the first coupling flow path  151 , the second coupling flow path  152 , and the third coupling flow path  153  do not interfere with the unit. 
     One end of the fourth coupling flow path  154  is exposed from the exposure opening  25 . Therefore, it is easy to access one end of the fourth coupling flow path  154  from the exposure opening  25 . As a result, the fourth coupling flow path  154  can be easily removed from the maintenance unit  71  or the selector unit  141 . 
     The fourth coupling flow path  154  includes the elastic second flow path part  157 . Therefore, the second flow path part  157  can be deformed. Thereby, when one unit is taken out of the exposure opening  25 , the second flow path part  157  can be deformed such that the fourth coupling flow path  154  does not interfere with the unit. For example, when the maintenance unit  71  or the selector unit  141  is taken out of the exposure opening  25 , the second flow path part  157  can be deformed such that the fourth coupling flow path  154  does not interfere with the unit. 
     When the fourth coupling flow path  154  is removed from the maintenance unit  71 , the second coupling joint  158  may be removed from the maintenance joint  80 , or the second flow path part  157  may be removed from the second coupling joint  158 . 
     In this example, not only one end of the coupling flow path but also both ends of the coupling flow path are exposed from the exposure opening  25 . Specifically, both ends of the first coupling flow path  151 , both ends of the second coupling flow path  152 , both ends of the third coupling flow path  153 , and both ends of the fourth coupling flow path  154  are exposed from the exposure opening  25 . Therefore, it is easy to access both ends of the first coupling flow path  151 , both ends of the second coupling flow path  152 , both ends of the third coupling flow path  153 , and both ends of the fourth coupling flow path  154  from the exposure opening  25 . As a result, from the exposure opening  25 , the first coupling flow path  151 , the second coupling flow path  152 , the third coupling flow path  153 , and the fourth coupling flow path  154  can be easily removed from the unit. 
     By removing both ends of the coupling flow path from the two units through the exposure opening  25 , even when the first flow path part  155  and the second flow path part  157  do not have elasticity, and when the unit is taken out of the exposure opening  25 , there is no concern that the coupling flow path interferes with the unit. 
     The plurality of fixing members are exposed from the exposure opening  25 . For example, when the exposure opening  25  is viewed from a position facing the opening surface  22 , a plurality of fixing members are exposed from the exposure opening  25 . Specifically, the supply fixing member  70 , the maintenance fixing member  97 , and the selector fixing member  146  are exposed from the exposure opening  25 . In addition, the mounting fixing member  107  is also exposed from the exposure opening  25 . 
     In this example, the supply tray  65  is exposed from the exposure opening  25 . Therefore, the supply fixing member  70  attached to the supply tray  65  is exposed from the exposure opening  25 . 
     In this example, the maintenance tray  92  is exposed from the exposure opening  25 . Therefore, the maintenance fixing member  97  attached to the maintenance tray  92  is exposed from the exposure opening  25 . 
     In this example, the support frame  145  is exposed from the exposure opening  25 . Therefore, the selector fixing member  146  attached to the support frame  145  is exposed from the exposure opening  25 . 
     In this example, the mounting section  102  is exposed from the exposure opening  25 . Therefore, the mounting fixing member  107  attached to the mounting section  102  is exposed from the exposure opening  25 . 
     The supply fixing member  70 , the maintenance fixing member  97 , the mounting fixing member  107 , and the selector fixing member  146  are exposed from the exposure opening  25 . Therefore, the supply fixing member  70 , the maintenance fixing member  97 , the mounting fixing member  107 , and the selector fixing member  146  can be easily accessed from the exposure opening  25 . Accordingly, it is easy to remove the supply fixing member  70 , the maintenance fixing member  97 , the mounting fixing member  107 , and the selector fixing member  146 . Therefore, it is easy to replace the unit. 
     When removing the supply unit  41  through the exposure opening  25 , the worker removes the supply fixing member  70 . The worker further removes the first supply joint  54  and the head joint  38 . The worker further removes the second supply joint  56  and the first coupling joint  156 . As a result, the worker can remove the supply unit  41  through the exposure opening  25 . 
     When removing the maintenance unit  71  through the exposure opening  25 , the worker removes the maintenance fixing member  97 . The worker further removes the maintenance joint  80  and the second coupling joint  158 . The worker further removes the mounting body  103  from the mounting section  102 . As a result, the worker can remove the maintenance unit  71  through the exposure opening  25 . 
     When the worker removes the selector unit  141  through the exposure opening  25 , the worker removes the selector fixing member  146 . The worker further removes the first coupling joint  156  and the second supply joint  56 . The worker further removes the second flow path part  157  from the second coupling joint  158 . As a result, the worker can remove the selector unit  141  through the exposure opening  25 . The worker may remove the selector unit  141  through the exposure opening  25  by removing the first coupling flow path  151 , the second coupling flow path  152 , the third coupling flow path  153 , and the fourth coupling flow path  154  from the selector valve  142 . The worker may remove the selector unit  141  through the exposure opening  25  by removing the second coupling joint  158  and the maintenance joint  80 . In this case, the worker removes, for example, the relay flow path part  165  from the second coupling joint  158  or the relay joint  166 . 
     When removing the mounting unit  101  through the exposure opening  25 , the worker removes the mounting fixing member  107 . The worker further removes the mounting body  103  from the mounting section  102 . As a result, the worker can remove the mounting unit  101  through the exposure opening  25 . 
     As illustrated in  FIG.  19   , when the supply unit  41 , the maintenance unit  71 , and the selector unit  141  are removed, the cap unit  111  is exposed from the exposure opening  25 . That is, when the exposure opening  25  is viewed from a position facing the opening surface  22 , the cap unit  111  is positioned to overlap at least one of the supply unit  41 , the maintenance unit  71 , and the selector unit  141 . When the exposure opening  25  is viewed from a position facing the opening surface  22 , the cap unit  111  is positioned behind the supply unit  41 , the maintenance unit  71 , and the selector unit  141 . Therefore, it is possible to suppress an increase in the size of the liquid ejecting apparatus  11  as compared with the case where there is no overlap. Further, when the cap unit  111  is configured to be taken out of the exposure opening  25 , the unit that overlaps with the cap unit  111  among the supply unit  41 , the maintenance unit  71 , and the selector unit  141  is taken out of the exposure opening  25 , the cap unit  111  can be accessed from the exposure opening  25 . 
     When the supply unit  41 , the maintenance unit  71 , and the selector unit  141  are removed, the wiping unit  131  is exposed from the exposure opening  25 . That is, when the exposure opening  25  is viewed from a position facing the opening surface  22 , the wiping unit  131  is positioned to overlap at least one unit among the supply unit  41 , the maintenance unit  71 , and the selector unit  141 . When the exposure opening  25  is viewed from a position facing the opening surface  22 , the wiping unit  131  is positioned behind the supply unit  41 , the maintenance unit  71 , and the selector unit  141 . Therefore, it is possible to suppress an increase in the size of the liquid ejecting apparatus  11  as compared with the case where there is no overlap. Further, when the wiping unit  131  is taken out of the exposure opening  25 , the unit that overlaps the wiping unit  131  among the supply unit  41 , the maintenance unit  71 , and the selector unit  141  is taken out of the exposure opening  25 , and accordingly, the wiping unit  131  can be accessed from the exposure opening  25 . 
     When the exposure opening  25  is viewed from a position facing the opening surface  22 , the cap unit  111  and the wiping unit  131  are arranged side by side. In this manner, when the exposure opening  25  is viewed from a position facing the opening surface  22 , the cap unit  111  and the wiping unit  131  are positioned not to overlap each other. Therefore, when accessing one unit of the cap unit  111  and the wiping unit  131  from the exposure opening  25 , the other unit does not interfere with the access. As a result, the cap unit  111  and the wiping unit  131  can be individually accessed from the exposure opening  25 . 
     Next, the operation and effect of the above embodiment will be described. 
     1. The exposure opening  25  exposes the supply unit  41 , the maintenance unit  71 , and the selector unit  141 . When the exposure opening  25  is viewed from a position facing the opening surface  22 , the supply unit  41 , the maintenance unit  71 , and the selector unit  141  are positioned not to overlap each other. 
     According to the above configuration, when one unit among the supply unit  41 , the maintenance unit  71 , and the selector unit  141  is taken out of the exposure opening  25 , the unit does not interfere with the other unit. Therefore, when one unit is taken out of the exposure opening  25 , it is not necessary to take out another unit. That is, the supply unit  41 , the maintenance unit  71 , and the selector unit  141  can be individually taken out of the exposure opening  25 . Therefore, it is easy to replace the unit. 
     2. The first coupling flow path  151 , the second coupling flow path  152 , and the third coupling flow path  153  include the elastic first flow path part  155 . The fourth coupling flow path  154  includes the elastic second flow path part  157 . One end of the first coupling flow path  151 , one end of the second coupling flow path  152 , one end of the third coupling flow path  153 , and one end of the fourth coupling flow path  154  are exposed from the exposure opening  25 . 
     According to the above configuration, one end of the first coupling flow path  151 , one end of the second coupling flow path  152 , one end of the third coupling flow path  153 , and one end of the fourth coupling flow path  154  are easily accessed through the exposure opening  25 . Therefore, for example, the first coupling flow path  151 , the second coupling flow path  152 , the third coupling flow path  153 , and the fourth coupling flow path  154  can be easily removed from one unit. Further, since the first flow path part  155  and the second flow path part  157  have elasticity, these parts can be deformed. As a result, when one unit is taken out of the exposure opening  25 , the first flow path part  155  and the second flow path part  157  can be deformed such that the first coupling flow path  151 , the second coupling flow path  152 , the third coupling flow path  153 , and the fourth coupling flow path  154  do not interfere with the supply unit  41 , the maintenance unit  71 , and the selector unit  141 . Therefore, it is easy to replace the unit. 
     3. Both ends of the first coupling flow path  151 , both ends of the second coupling flow path  152 , both ends of the third coupling flow path  153 , and both ends of the fourth coupling flow path  154  are exposed from the exposure opening  25 . 
     According to the above configuration, both ends of the first coupling flow path  151 , both ends of the second coupling flow path  152 , both ends of the third coupling flow path  153 , and both ends of the fourth coupling flow path  154  are easily accessed through the exposure opening  25 . Therefore, for example, the first coupling flow path  151 , the second coupling flow path  152 , the third coupling flow path  153 , and the fourth coupling flow path  154  can be easily removed from both units. By removing both ends of the first coupling flow path  151 , both ends of the second coupling flow path  152 , both ends of the third coupling flow path  153 , and both ends of the fourth coupling flow path  154  from the unit, the first coupling flow path  151 , the second coupling flow path  152 , the third coupling flow path  153 , and the fourth coupling flow path  154  can be taken out of the exposure opening  25 . As a result, when one unit is taken out of the exposure opening  25 , there is no concern that the first coupling flow path  151 , the second coupling flow path  152 , the third coupling flow path  153 , and the fourth coupling flow path  154  interfere with the supply unit  41 , the maintenance unit  71 , and the selector unit  141 . Therefore, it is easy to replace the unit. 
     4. When the exposure opening  25  is viewed from the position facing the opening surface  22 , the cap unit  111  is positioned to overlap at least one of the supply unit  41 , the maintenance unit  71 , and the selector unit  141 . 
     According to the above configuration, the size expansion of the liquid ejecting apparatus  11  can be suppressed as compared with the case where the cap unit  111  does not overlap at least one of the supply unit  41 , the maintenance unit  71 , and the selector unit  141 . Further, when the cap unit  111  is taken out of the exposure opening  25 , the cap unit  111  can be accessed from the exposure opening  25  by removing the unit that overlaps the cap unit  111 . That is, the cap unit  111  can be accessed in addition to the supply unit  41 , the maintenance unit  71 , and the selector unit  141  through the exposure opening  25 . In this manner, the opening that can access the supply unit  41 , the maintenance unit  71 , and the selector unit  141 , and the opening that can access the cap unit  111  are integrated as the exposure opening  25 . Therefore, workability is improved when the unit is replaced or repaired. 
     5. When the exposure opening  25  is viewed from the position facing the opening surface  22 , the wiping unit  131  is positioned to overlap at least one of the supply unit  41 , the maintenance unit  71 , and the selector unit  141 . 
     According to the above configuration, the size expansion of the liquid ejecting apparatus  11  can be suppressed as compared with the case where the wiping unit  131  does not overlap at least one of the supply unit  41 , the maintenance unit  71 , and the selector unit  141 . Further, when the wiping unit  131  is taken out of the exposure opening  25 , the wiping unit  131  can be accessed from the exposure opening  25  by removing the unit that overlaps the wiping unit  131 . That is, in addition to the supply unit  41 , the maintenance unit  71 , and the selector unit  141 , the wiping unit  131  can also be accessed through the exposure opening  25 . In this manner, the opening that can access the supply unit  41 , the maintenance unit  71 , and the selector unit  141 , and the opening that can access the wiping unit  131  are integrated as the exposure opening  25 . Therefore, workability is good when the unit is replaced or repaired. 
     6. When the exposure opening  25  is viewed from the position facing the opening surface  22 , the cap unit  111  and the wiping unit  131  are positioned not to overlap each other. 
     According to the above configuration, the cap unit  111  and the wiping unit  131  can be individually accessed from the exposure opening  25 . Therefore, workability is good when the cap unit  111  and the wiping unit  131  are replaced or repaired. 
     7. The exposure opening  25  exposes the mounting unit  101 . When the exposure opening  25  is viewed from the position facing the opening surface  22 , the mounting unit  101  is positioned not to overlap the supply unit  41 , the maintenance unit  71 , and the selector unit  141 . 
     According to the above configuration, when the mounting unit  101  is taken out of the exposure opening  25 , the mounting unit  101  does not interfere with the supply unit  41 , the maintenance unit  71 , and the selector unit  141 . That is, the supply unit  41 , the maintenance unit  71 , the selector unit  141 , and the mounting unit  101  can be individually taken out of the exposure opening  25 . Therefore, it is easy to replace the unit. 
     8. Fixing members such as the supply fixing member  70 , the maintenance fixing member  97 , and the selector fixing member  146  are exposed from the exposure opening  25 . In this example, the mounting fixing member  107  is further exposed from the exposure opening  25 . 
     According to the above configuration, the fixing member can be easily removed through the exposure opening  25 . As a result, workability is good when the supply unit  41 , the maintenance unit  71 , and the selector unit  141  are replaced through the exposure opening  25 . In this example, workability is good even when the mounting unit  101  is replaced. 
     9. The supply unit  41  has the supply tray  65 . The supply tray  65  is fixed to the housing  12  by the supply fixing member  70 . The supply tray  65  is exposed from the exposure opening  25 . The supply fixing member  70  is exposed from the exposure opening  25 . According to the above configuration, the supply fixing member  70  can be easily removed through the exposure opening  25 . As a result, workability is good when the supply unit  41  is replaced through the exposure opening  25 . 
     10. The maintenance unit  71  has the maintenance tray  92 . The maintenance tray  92  is fixed to the housing  12  by the maintenance fixing member  97 . The maintenance tray  92  is exposed from the exposure opening  25 . The maintenance fixing member  97  is exposed from the exposure opening  25 . 
     According to the above configuration, the maintenance fixing member  97  can be easily removed through the exposure opening  25 . As a result, workability is good when the maintenance unit  71  is replaced through the exposure opening  25 . 
     11. The supply detecting portion  66  is positioned on the supply tray  65 . The maintenance detecting portion  93  is positioned on the maintenance tray  92 . 
     According to the above configuration, the supply detecting portion  66  detects the liquid in the supply tray  65 . The maintenance detecting portion  93  detects the waste liquid in the maintenance tray  92 . The maintenance detecting portion  93  detects the moisturizer in the maintenance tray  92 . Thereby, the liquid leakage in the liquid ejecting apparatus  11  can be detected. 
     The present embodiment can be modified and implemented as follows. The present embodiment and the following modification examples can be implemented in combination with each other within a technically consistent range. 
     The liquid ejecting apparatus  11  may include a flow path for coupling the supply unit  41  and the maintenance unit  71  as a coupling flow path. For example, the liquid ejecting apparatus  11  may include a coupling flow path for directly sending the liquid as waste liquid from the supply unit  41  to the maintenance unit  71 . In this case, at least one end of the coupling flow path for coupling the supply unit  41  and the maintenance unit  71  may be exposed from the exposure opening  25 . 
     The liquid discharged by the head  32  is not limited to ink, and may be, for example, a liquid material in which particles of a functional material are dispersed or mixed in the liquid. For example, the head  32  may discharge a liquid material containing a material such as an electrode material or a pixel material used for manufacturing a liquid crystal display, an electroluminescence display, a surface emitting display, or the like in a dispersed or dissolved form. 
     Hereinafter, the technical idea grasped from the embodiment and the modification examples described above and the action effects thereof will be described. 
     A. A liquid ejecting apparatus including: a head having a nozzle that ejects a liquid; a supply unit that supplies a liquid to the head; a maintenance unit for maintaining the head; a selector unit that selects a unit to be opened to an atmosphere from the supply unit and the maintenance unit; and a housing that accommodates the supply unit, the maintenance unit, and the selector unit, in which the housing has an opening surface to which an exposure opening is open and a cover that closes the exposure opening, the exposure opening exposes the supply unit, the maintenance unit, and the selector unit, and when the exposure opening is viewed from a position facing the opening surface, the supply unit, the maintenance unit, and the selector unit are positioned not to overlap each other. 
     According to the above configuration, when one unit among the supply unit, the maintenance unit, and the selector unit is taken out of the exposure opening, the unit does not interfere with the other unit. Therefore, when one unit is taken out of the exposure opening, it is not necessary to take out another unit. That is, the supply unit, the maintenance unit, and the selector unit can be individually taken out of the exposure opening. Therefore, it is easy to replace the unit. 
     B. The liquid ejecting apparatus may further include a coupling flow path for coupling two units among the supply unit, the maintenance unit, and the selector unit, the coupling flow path may include an elastic flow path part, and one end of the coupling flow path may be exposed from the exposure opening. 
     According to the above configuration, it is easy to access one end of the coupling flow path through the exposure opening. Therefore, the coupling flow path can be easily removed from one unit. Since the flow path part has elasticity, the flow path part can be deformed. Thereby, when one unit is taken out of the exposure opening, the flow path part can be deformed such that the coupling flow path does not interfere with the supply unit, the maintenance unit, and the selector unit. Therefore, it is easy to replace the unit. 
     C. The liquid ejecting apparatus may further include a coupling flow path for coupling two units among the supply unit, the maintenance unit, and the selector unit, and both ends of the coupling flow path may be exposed from the exposure opening. 
     According to the above configuration, it is easy to access both ends of the coupling flow path through the exposure opening. Therefore, the coupling flow path can be easily removed from both units. By removing both ends of the coupling flow path from the unit, the coupling flow path can be taken out of the exposure opening. As a result, when one unit is taken out of the exposure opening, there is no concern that the coupling flow path interferes with the supply unit, the maintenance unit, and the selector unit. Therefore, it is easy to replace the unit. 
     D. The liquid ejecting apparatus may further include a cap unit that comes into contact with the head to cover the nozzle, and when the exposure opening is viewed from the position facing the opening surface, the cap unit may be positioned to overlap at least one of the supply unit, the maintenance unit, and the selector unit. 
     According to the above configuration, the size expansion of the liquid ejecting apparatus can be suppressed as compared with the case where the cap unit does not overlap at least one of the supply unit, the maintenance unit, and the selector unit. Further, when the cap unit is taken out of the exposure opening, the cap unit can be accessed from the exposure opening by removing the unit that overlaps the cap unit. That is, the cap unit can be accessed in addition to the supply unit, the maintenance unit, and the selector unit through the exposure opening. In this manner, the opening that can access the supply unit, the maintenance unit, and the selector unit, and the opening that can access the cap unit are integrated as the exposure opening. Therefore, workability is improved when the unit is replaced or repaired. 
     E. The liquid ejecting apparatus may further include a wiping unit that wipes a nozzle surface in which the nozzle is open in the head, and when the exposure opening is viewed from the position facing the opening surface, the wiping unit may be positioned to overlap at least one of the supply unit, the maintenance unit, and the selector unit. 
     According to the above configuration, the size expansion of the liquid ejecting apparatus can be suppressed as compared with the case where the wiping unit does not overlap at least one of the supply unit, the maintenance unit, and the selector unit. Further, when the wiping unit is taken out of the exposure opening, the wiping unit can be accessed from the exposure opening by removing the unit that overlaps the wiping unit. That is, in addition to the supply unit, the maintenance unit, and the selector unit, the wiping unit can also be accessed through the exposure opening. In this manner, the opening that can access the supply unit, the maintenance unit, and the selector unit, and the opening that can access the wiping unit are integrated as the exposure opening. Therefore, workability is good when the unit is replaced or repaired. 
     F. In the liquid ejecting apparatus, when the exposure opening is viewed from the position facing the opening surface, the cap unit and the wiping unit may be positioned not to overlap each other. 
     According to the above configuration, the cap unit and the wiping unit can be individually accessed from the exposure opening. Therefore, workability is good when the cap unit and the wiping unit are replaced or repaired. 
     G. The liquid ejecting apparatus may further include a mounting unit configured such that a mounting body for accommodating a liquid ejected as a waste liquid from the head is mounted, and the exposure opening may expose the mounting unit, and when the exposure opening is viewed from the position facing the opening surface, the mounting unit may be positioned not to overlap the supply unit, the maintenance unit, and the selector unit. 
     According to the above configuration, when the mounting unit is taken out of the exposure opening, the mounting unit does not interfere with the supply unit, the maintenance unit, and the selector unit. That is, the supply unit, the maintenance unit, the selector unit, and the mounting unit can be individually taken out of the exposure opening. Therefore, it is easy to replace the unit. 
     H. The liquid ejecting apparatus may further include a plurality of fixing members that fix the supply unit, the maintenance unit, and the selector unit to the housing, respectively, and the plurality of fixing members may be exposed from the exposure opening. 
     According to the above configuration, the fixing member can be easily removed through the exposure opening. As a result, workability is good when the supply unit, the maintenance unit, and the selector unit are replaced through the exposure opening. 
     I. The liquid ejecting apparatus may further include a fixing member that fixes the supply unit to the housing, the supply unit may have a tray, the tray may be fixed to the housing by the fixing member and exposed from the exposure opening, and the fixing member may be exposed from the exposure opening. According to the above configuration, the fixing member can be easily removed through the exposure opening. As a result, workability is good when the supply unit is replaced through the exposure opening. 
     J. The liquid ejecting apparatus may further include a fixing member that fixes the maintenance unit to the housing, the maintenance unit may have a tray, the tray may be fixed to the housing by the fixing member and exposed from the exposure opening, and the fixing member may be exposed from the exposure opening. According to the above configuration, the fixing member can be easily removed through the exposure opening. As a result, workability is good when the maintenance unit is replaced through the exposure opening. 
     K. The liquid ejecting apparatus may further include a detecting portion that detects a liquid, and the detecting portion may be positioned on the tray. According to the above configuration, the detecting portion detects the liquid in the tray. Thereby, the liquid leakage in the liquid ejecting apparatus can be detected.