Patent Publication Number: US-11376852-B2

Title: Liquid ejection apparatus

Description:
The present application is based on, and claims priority from JP Application Serial Number 2019-130972, filed Jul. 16, 2019, the disclosure of which is hereby incorporated by reference herein in its entirety. 
     BACKGROUND 
     1. Technical Field 
     The present disclosure relates to a liquid ejection apparatus that ejects liquid. 
     2. Related Art 
     In a liquid ejection apparatus, a reduction in a size of an apparatus body is required from the viewpoint of responding to various installation places. In particular, there is a demand for a casing that occupies a small area when the liquid ejection apparatus is installed on a desk or floor. 
     JP-A-2018-161851 discloses a recording apparatus as an example of a liquid ejection apparatus that ejects liquid onto a medium such as paper while a carriage including a recording head as an example of a liquid ejection head moves. The carriage is provided with an ink tank as an example of a liquid container that contains ink to be supplied to the recording head. The ink tank includes a remaining amount checking section formed of a transparent material that allows a remaining amount of liquid inside thereof to be visually recognized, and a visual recognition section that allows the remaining amount checking section of the ink tank to be visually recognized is provided on a side surface on the apparatus front side of the carriage. 
     The liquid ejection apparatus includes a maintenance device that performs maintenance for discharging liquid from nozzles of the liquid ejection head for the purpose of, for example, eliminating clogging of the nozzles of the liquid ejection head. Usually, a liquid ejection apparatus is mounted with a waste liquid container that contains liquid discharged from the liquid ejection head as waste liquid. 
     However, in the liquid ejection apparatus described in JP-A-2018-161851, a mounting area of the apparatus may increase due to layout of components in a casing depending on the position where the waste liquid container is mounted in the casing. On the other hand, if a component layout that avoids an increase in the mounting area of the apparatus is adopted, operability when attaching and detaching the waste liquid container to and from the casing may be deteriorated. 
     SUMMARY 
     According to an aspect of the present disclosure, there is provided a liquid ejection apparatus including a liquid ejection head that ejects liquid to a medium transported in a transport direction on a transport path, a liquid container that includes a containing chamber for containing liquid to be supplied to the liquid ejection head and an inlet for pouring the liquid into the containing chamber, a carriage movable in a scanning direction that intersects the transport direction in a state where the liquid ejection head and the liquid container are loaded on the carriage, and a mounting portion on which a waste liquid container that contains liquid as waste liquid discharged from the liquid ejection head is detachably mounted, in which the mounting portion is provided in a region on a front side in the transport direction of the liquid ejection apparatus and when the liquid ejection head is located outside the transport path in the scanning direction, the carriage is disposed at a position that overlaps the mounting portion in a vertical direction. The expression “overlapping the mounting portion in the vertical direction” includes a case where the carriage overlaps the entire mounting portion and a case where the carriage overlaps only a part of the mounting portion. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective view illustrating an appearance of a liquid ejection apparatus according to a first embodiment. 
         FIG. 2  is a side cross-sectional view taken along line II-II in  FIG. 1 . 
         FIG. 3  is a side cross-sectional view taken along line in  FIG. 1 . 
         FIG. 4  is a front cross-sectional view taken along line IV-IV in  FIG. 1  in a state where a carriage has moved to a home position. 
         FIG. 5  is a front cross-sectional view taken along line V-V in  FIG. 1  in a state where the carriage has moved to an ink pouring position. 
         FIG. 6  is a perspective view illustrating a state where the carriage has moved to a home position. 
         FIG. 7  is a perspective view illustrating a state where a carriage has moved to an ink pouring position. 
         FIG. 8  is a front view illustrating a mounting portion of the liquid ejection apparatus. 
         FIG. 9  is a perspective view illustrating the mounting portion of the liquid ejection apparatus. 
         FIG. 10  is a perspective view illustrating a waste liquid container. 
         FIG. 11  is a side view illustrating one side surface of the waste liquid container. 
         FIG. 12  is a rear view illustrating the waste liquid container. 
         FIG. 13  is a front cross-sectional view illustrating a liquid ejection apparatus when a carriage is at a home position in a second embodiment. 
         FIG. 14  is a front cross-sectional view illustrating the liquid ejection apparatus when the carriage is at an ink pouring position. 
         FIG. 15  is a front cross-sectional view illustrating a liquid ejection apparatus when a carriage is at a home position in a third embodiment. 
         FIG. 16  is a front cross-sectional view illustrating the liquid ejection apparatus when the carriage is at an ink pouring position. 
         FIG. 17  is a front cross-sectional view illustrating a liquid ejection apparatus when a carriage is at a home position in a fourth embodiment. 
         FIG. 18  is a front cross-sectional view illustrating the liquid ejection apparatus when the carriage is at an ink pouring position. 
     
    
    
     DESCRIPTION OF EXEMPLARY EMBODIMENTS 
     Hereinafter, an embodiment of a liquid ejection apparatus will be described with reference to the accompanying drawings. In the XYZ coordinate system illustrated in each figure, the X-axis indicates an apparatus width direction, the Y-axis indicates an apparatus depth direction, and the Z-axis indicates an apparatus height direction. The +Y-direction is defined as the front of the apparatus, and the −Y-direction is defined as the rear of the apparatus. The +X-direction, which is the left when viewed from the front of the apparatus, is defined as the left side of the apparatus, and the −X-direction, which is the right when viewed from the front of the apparatus, is defined as the right side of the apparatus. The +Z-direction is defined as the upper side, and the −Z-direction side is defined as the lower side. The −Z-direction is also referred to as the vertical direction. The direction when passing through a recording area where recording is performed on the medium is the +Y-direction, which is also referred to as a transport direction. 
     First Embodiment 
     Hereinafter, a first embodiment of a liquid ejection apparatus will be described with reference to the accompanying drawings. 
     Overview of Liquid Ejection Apparatus 
     As illustrated in  FIG. 1 , a liquid ejection apparatus  11  includes a casing  12  including a recording section  18  for performing recording on a medium therein, and a scanner unit  14  provided on an upper part of the casing  12  and reading an image of a document. The liquid ejection apparatus  11  is configured as a multifunction peripheral having an image reading function in addition to a recording function. 
     Examples of the medium on which recording is performed include thick paper such as postcards and business cards thicker than plain paper, thin paper thinner than plain paper, and glossy paper for photographs, and the like, in addition to plain paper. The liquid ejection apparatus  11  is also configured to be able to record on a label surface of a disk-type memory such as a CD or DVD. 
     The recording section  18  includes a liquid ejection head  20  that ejects ink as an example of liquid and a carriage  30  on which the liquid ejection head  20  is loaded, and performs recording by ejecting ink from the liquid ejection head  20  toward a medium P. 
     As illustrated in  FIG. 1 , a panel unit  23  including an operation section  16  is provided in front of the apparatus of the liquid ejection apparatus  11 . The user performs various setting operations and execution operations of the liquid ejection apparatus  11  by using an operation section  16 . On a panel unit  23 , an operation surface  16   a  for displaying setting contents and operation status of the liquid ejection apparatus  11 , preview of an image, and the like is disposed. 
     About Transport Path 
     As illustrated in  FIG. 2 , a lower cover  17  is provided below a front surface  12   a  of a casing  12 . By opening the lower cover  17  as illustrated by a broken line in  FIG. 2 , a medium tray  21  for storing the medium P before recording and a discharge tray  22  for receiving the medium P discharged after recording are exposed. 
     The discharge tray  22  is configured to be switchable between an accommodated state accommodated in the casing  12  indicated by a solid line in  FIG. 2  and a protruding state in which the casing  12  protrudes to the front of the apparatus) as indicated by the broken line in  FIG. 2 , and stores the recorded medium in the protruding state. 
     As illustrated in  FIG. 2 , the medium tray  21  is capable of storing a plurality of media P, and is attachable and detachable to and from the casing  12 . The medium tray  21  sends out the medium P to a transport path  40  indicated by one-dot chain line in  FIG. 2  in a state of being mounted to the casing  12 . The user replenishes the medium P in a state where the medium tray  21  is pulled out forward. The transport path  40  is a path through which the medium P fed from the medium tray  21  provided at the lower part of the liquid ejection apparatus  11  passes through the recording area of the recording section  18  and is discharged to the discharge tray  22 . The transport direction in this embodiment is a direction (+Y-direction) in which the medium passes through the recording area of the recording section  18 . 
     The medium P set on the medium tray  21  is picked up by a feed roller  26  and sent out to the transport path  40 . The feed roller  26 , which is rotationally driven by a driving source (not illustrated), is provided on a roller support member  29  that swings around a swing shaft  29   a , and rotates in contact with the uppermost one of a plurality of media P stored in the medium tray  21  to send out the uppermost medium P from the medium tray  21  to the rear of the apparatus. 
     As illustrated in  FIG. 2 , an intermediate roller  27  that is rotationally driven by a driving source (not illustrated) is provided downstream of the feed roller  26 . The medium P is curved and inverted by the intermediate roller  27  and sent to the front of the apparatus. Driven rollers  28   a ,  28   b ,  28   c , and  28   d  are driven and rotated by the intermediate roller  27 . The medium P is nipped by the driven roller  28   a  and the intermediate roller  27 , subsequently nipped by the driven roller  28   b  and the intermediate roller  27 , further nipped by the driven roller  28   c  and the intermediate roller  27 , and sent downstream. The driven roller  28   d  will be described later. 
     A transport roller pair  31  is provided downstream of the intermediate roller  27 , and the medium P is sent below the liquid ejection head  20  by the transport roller pair  31 . In the transport roller pair  31 , a lower roller is rotationally driven by a driving source (not illustrated), and an upper roller is driven to rotate when the lower roller is rotated. 
     As illustrated in  FIG. 2 , the recording section  18  is provided downstream of the transport roller pair  31 . In the recording section  18 , the liquid ejection head  20  that ejects ink is provided on the bottom of the carriage  30 . 
     At a position facing the liquid ejection head  20 , a medium support member  33  that supports the medium P transported in the transport path  40  is provided, and a distance between the medium P and the liquid ejection head  20  is prescribed by the medium support member  33 . 
     The transport roller pair  31  transports the medium P onto the medium support member  33  along the transport direction. Then, the liquid ejection head  20  performs recording by ejecting liquid onto the medium P supported by the medium support member  33  and transported on the transport path  40  in the transport direction. In this embodiment, the recording area is an area where recording is performed by ejecting liquid onto the medium P by the liquid ejection head  20 . 
     As illustrated in  FIG. 2 , a discharge roller pair  32  is provided downstream of the medium support member  33 . Also, in the discharge roller pair  32 , similarly to the transport roller pair  31 , a lower roller is rotationally driven by a driving source (not shown), and an upper roller is driven to rotate when the lower roller is rotated. The recorded medium P is discharged by the discharge roller pair  32  toward the discharge tray  22  which is in the protruding state illustrated by a broken line in  FIG. 2 . 
     The liquid ejection apparatus  11  is configured to be able to perform double-sided recording in which recording is performed on a first surface of the medium P and a second surface opposite to the first surface. When double-sided recording is performed, the medium P is switched back and sent to the rear of the apparatus after recording on the first surface. The medium P that has been switched back is nipped by the driven roller  28   d  and the intermediate roller  27  and is joined to the transport path  40 . The medium P is reversed by the intermediate roller  27  and is transported below the liquid ejection head  20  in a state where the second surface faces the liquid ejection head  20 , and recording on the second surface is performed. 
     The liquid ejection apparatus  11  is configured to be able to supply the medium P on which recording is performed from a supply port  19  provided at the upper part of the rear of the apparatus. The supply port  19  is opened by opening a supply port cover  13 . The medium P supplied from the supply port  19  enters the transport path  40  from upstream of the transport roller pair  31 . The liquid ejection head  20  ejects liquid onto the medium P that is transported on the transport path  40  in the transport direction. 
     About Carriage Movement 
     As illustrated in  FIG. 3 , the liquid ejection apparatus  11  includes the carriage  30  on which the liquid ejection head  20  is loaded and reciprocated in the apparatus width direction, a guide plate  125  extending in a moving direction of the carriage  30 , a carriage motor  170  for reciprocating the carriage  30 , and a control section  200  that controls driving of the carriage motor  170 . A direction in which the carriage  30  moves is referred to as a scanning direction. 
     In this embodiment, the scanning direction and the apparatus width direction are the same direction, and the transport direction (+Y-direction) is the same direction as the apparatus depth direction. The scanning direction and the transport direction intersect (are orthogonal in this embodiment p). The carriage  30  is movable in the scanning direction in a state where the liquid ejection head  20  and a liquid container  34  containing liquid to be ejected by the liquid ejection head  20  are mounted to the carriage  30 . The liquid ejection apparatus  11  of this embodiment employs an ink pouring method in which a user pours ink from a liquid replenishing container into the liquid container  34  mounted to the carriage  30 . The liquid replenishing container is, for example, an ink supply bottle containing ink. 
     As illustrated in  FIGS. 4 and 6 , a position where the carriage  30  waits (the position in  FIGS. 4 and 6 ) before the liquid ejection head  20  starts printing on the medium P is referred to as a home position HP. At the home position HP, capping and a maintenance operation are performed. The capping and maintenance operation will be described later. The home position HP is set at one end of a movement area of the carriage  30 , and in this embodiment, is set at the end on the −X-direction side. The side on which the home position is present in the scanning direction is referred to as the home position HP side, and the side opposite to the home position HP is referred to as an opposite home position side. 
     As illustrated in  FIGS. 5 and 7 , when the ink reduced by performing the recording is poured, the carriage  30  waits at a predetermined position (the position in  FIGS. 5 and 7 ). The liquid ejection apparatus  11  according to this embodiment is configured to be able to pour ink into the liquid container  34  (see  FIG. 7 ) when the carriage  30  is at the predetermined position and the scanner unit  14  is in an open state. The pouring of ink will be described later. 
     About Maintenance Mechanism 
     As illustrated in  FIG. 3 , a maintenance mechanism  130  for maintaining the liquid ejection head  20  is accommodated in the casing  12 . The liquid ejection apparatus  11  includes a control section  200  that controls operations of components including the liquid ejection head  20  and the maintenance mechanism  130  at a predetermined position in the casing  12 . 
     The maintenance mechanism  130  is positioned to align with the medium support member  33  (see  FIG. 2 ) along the scanning direction of the liquid ejection head  20 . The maintenance mechanism  130  includes a cap  131  disposed at one end side in the scanning direction, a wiper (not illustrated) for wiping the liquid ejection head  20 , and a suction pump  134  coupled to the cap  131  via a suction tube  133 . 
     As illustrated in  FIG. 3 , the liquid ejection apparatus  11  includes a mounting portion  118  to which a waste liquid container  150  is detachably mounted. The maintenance mechanism  130  is positioned upstream of the mounting portion  118  in the transport direction. The suction pump  134  constituting the maintenance mechanism  130  is coupled to the mounting portion  118  through a discharge tube  135 . That is, the suction pump  134  is coupled to the waste liquid container  150  mounted to the mounting portion  118  through the discharge tube  135 . The cap  131  is supported by a support frame  137  in the casing  12  via an urging member  136 . The cap  131  is configured to be movable by a moving mechanism (not illustrated) between an open position separated from the liquid ejection head  20  and a capping position (position illustrated in  FIG. 3 ) surrounding a nozzle  120  and in contact with the liquid ejection head  20 . The cap  131  present at the capping position is urged by the urging force of an urging member  136  in a direction in which the cap  131  is pressed against the liquid ejection head  20 . 
     As illustrated in  FIG. 3 , the maintenance mechanism  130  performs a maintenance operation of the liquid ejection head  20  under control of the control section  200 . The maintenance operation is an operation for preventing or eliminating an ejection failure of the liquid ejection head  20 . For example, when a power supply  201  of the liquid ejection head  20  is turned off, the liquid ejection head  20  is disposed at the home position HP (see  FIG. 4 ) where the cap  131  is present (the position illustrated in  FIG. 3 ). 
     Then, the maintenance mechanism  130  moves the cap  131  to the capping position, and performs capping for forming a closed space surrounding the nozzle  120  between the liquid ejection head  20  and the cap  131 . Due to the capping, there is little possibility that clogging due to drying of the ink in the nozzle  120  occurs. 
     As illustrated in  FIG. 3 , the maintenance mechanism  130  executes suction cleaning in which liquid in the liquid ejection head  20  is forced to flow out from the nozzle  120  by driving the suction pump  134  in a capping state. A configuration in which a pressurizing section is provided to pressurize the liquid in the liquid container  34  to execute pressurization cleaning in which the liquid flows out from the nozzle  120  may be adopted. 
     Cleaning including the suction cleaning and the pressurization cleaning may be performed at the time of initial filling when a flow path up to the nozzle  120  is filled with the liquid, or may be performed as a maintenance operation for eliminating the ejection failure by a user&#39;s operation when the ejection failure of liquid occurs due to clogging of the nozzle  120  or the like. Cleaning may be periodically performed every time a fixed time elapses. Cleaning may be performed when an ejection failure is detected by a nozzle inspection section that detects the presence or absence of the ejection failure due to clogging of the nozzle  120 . 
     After the cleaning, the maintenance mechanism  130  moves the cap  131  to the open position, performs idle suction again to drive the suction pump  134  in a state where the inside of the cap  131  is opened to the atmosphere, and sucks waste liquid remaining in the cap  131 . Then, the liquid that has flown out from the liquid ejection head  20  by the cleaning and the idle suction is stored in the waste liquid container  150  through the discharge tube  135  as waste liquid containing air bubbles, a solute component of the liquid increased in viscosity, and the like. 
     About Mounting Portion 
     As illustrated in  FIG. 3 , the lower cover  17  attached below the panel unit  23  on the apparatus front side of the liquid ejection apparatus  11  is disposed at a closed position (see  FIG. 1 ) and an open position (see  FIG. 3 ) by being rotated substantially 90 degrees around the lower end side. 
     As illustrated in  FIG. 3 , when the lower cover  17  is disposed at the open position, a containing body cover  117  detachably mounted to the casing  12  is exposed. The liquid ejection apparatus  11  includes the mounting portion  118 . The containing body cover  117  covers an opening of the mounting portion  118  to which the waste liquid container  150  is detachably mounted. The containing body cover  117  has elasticity in the mounting direction, and presses the waste liquid container  150  in the mounting direction by its elastic force so that the inserted waste liquid container  150  does not fall out from the mounting portion  118 . A substrate coupling portion  143  that is electrically coupled to a circuit substrate  156  (see  FIG. 11 ) provided on the waste liquid container  150  inserted into the mounting portion  118  is provided on the depth side of the mounting portion  118 . The containing body cover  117  may be configured to be fixed to the casing  12  with screws or the like. 
     As illustrated in  FIG. 3 , the waste liquid container  150  that stores liquid as waste liquid discharged from the liquid ejection head  20  is detachably mounted to the mounting portion  118  in front of the apparatus, which is downstream in the transport direction of the casing  12 . Then, when the waste liquid container  150  is filled with waste liquid or the like, the waste liquid container  150  is taken out from the mounting portion  118  and replaced with a new one. An absorber  150   a  capable of absorbing waste liquid may be accommodated in the waste liquid container  150 . 
     As illustrated in  FIG. 3 , since the substrate coupling portion  143  is positioned on the depth side of the mounting portion  118  which opens forward, the waste liquid container  150  is mounted to the mounting portion  118  as it moves rearward, and is removed from the mounting portion  118  as it moves forward. That is, the waste liquid container  150  is detachably mounted from the front of the apparatus, which is downstream in the transport direction of the casing  12 . Here, the transport direction of the medium P is the direction in which the waste liquid container  150  is taken out from the mounting portion  118 , and the direction opposite to the transport direction is the mounting direction in which the waste liquid container  150  is mounted to the mounting portion  118 . 
     The direction in which the user removes the waste liquid container  150  from the mounting portion  118  is the transport direction. The direction in which the waste liquid container  150  is removed from the mounting portion  118  is parallel to the direction in which the discharge tray  22  extends, is the same as the direction in which the user pulls out the discharge tray  22  (see  FIG. 2 ), and is the same as the direction in which the user pulls out the medium tray  21  when the user replenishes the medium tray  21  with the medium P. 
     About Position Relationship Between Mounting Portion, Maintenance Mechanism, Carriage, and Inlet 
     As illustrated in  FIG. 4 , the medium tray  21  is disposed at the bottom of the center of the liquid ejection apparatus  11 . In this embodiment, since the medium P fed from the medium tray  21  is transported on the transport path  40  in the transport direction, a storing range for the medium P having the maximum width stored in the medium tray  21  in the scanning direction is a range of the transport path  40 . The transport path  40  is positioned on the medium support member  33  that supports the medium P to be transported. The transport path  40  is a range spanning from the +X side of the right end RE of the transport path  40  to the −X-direction side of the left end LE of the transport path  40 . When a part of the carriage  30  deviates from the transport path  40  in the scanning direction, the carriage  30  is said to be outside the transport path  40  in the scanning direction. 
     The medium tray  21  and the discharge tray  22  (see  FIG. 2 ) are disposed inside the transport path  40 , and there is no space for disposing other components. For that reason, other components are disposed outside the transport path  40  in the scanning direction. In this embodiment, the maintenance mechanism  130  that performs the cleaning operation of the liquid ejection head  20  and the mounting portion  118  to which the waste liquid container  150  that contains liquid as waste liquid discharged from the liquid ejection head  20  is detachably mounted are disposed outside the transport path  40  in the scanning direction. 
     As illustrated in  FIGS. 3 and 4 , the mounting portion  118  is outside the transport path  40  in the scanning direction of the carriage  30  and on downstream in the transport direction inside the casing  12 . In this embodiment, the mounting portion  118  is outside on the home position HP side in the transport path  40 . 
     As illustrated in  FIG. 3 , in this embodiment, the following component layout is adopted in order to load the waste liquid container  150  detachably mounted to the liquid ejection apparatus  11 . The liquid ejection head  20  is disposed on the apparatus rear side of the carriage  30 , and the cap  131  is disposed directly below the liquid ejection head  20 . By retracting the maintenance mechanism  130  in the casing  12  to the apparatus rear side while maintaining this position condition of the cap  131 , a disposition space capable of accommodating the mounting portion  118  is secured in a downstream area in the transport direction inside the casing  12 . By accommodating the mounting portion  118  in the disposition space, the mounting portion  118  is disposed in front of the apparatus. 
     That is, the liquid ejection head  20  is disposed at a position on the rear side at the bottom of the carriage  30 . In the depth direction Y, a portion of the maintenance mechanism  130  downstream of the cap  131  extends longer than a portion of the maintenance mechanism  130  upstream of the cap  131 . The suction pump  134  is disposed at a position upstream of the cap  131 . In the depth direction Y, the downstream end of the maintenance mechanism  130  is positioned between the downstream end of the cap  131  and the downstream end of the carriage  30 . The downstream end of the maintenance mechanism  130  is positioned closer to the downstream end of the cap  131  than the downstream end of the carriage  30 . In the depth direction Y, the downstream end of the maintenance mechanism  130  is positioned at the same position as the center position of the length range of the carriage  30  or upstream of the carriage  30 . Since the upstream end of the waste liquid container  150  is substantially adjacent to the downstream end of the maintenance mechanism  130 , the position condition of the downstream end of the maintenance mechanism  130  described above is also the position condition of the upstream end of the waste liquid container  150 . 
     For that reason, when the carriage  30  is at the home position HP, the disposition space for the mounting portion  118  is secured downstream (apparatus front side) of the maintenance mechanism  130  in the depth direction Y, below the carriage  30 . In the apparatus depth direction Y, the downstream end of the waste liquid container  150  is positioned downstream of the downstream end of the carriage  30 . A handle portion  151   a  (see also  FIG. 10 ) protruding horizontally at the downstream end of the waste liquid container  150  overlaps the panel unit  23  in the vertical direction. 
     Position Relationship Between Components in Liquid Container and Pouring Position 
     As illustrated in  FIGS. 5 and 7 , the user pours ink reduced by performing recording or the like into the liquid container  34  mounted to the carriage  30 . The liquid ejection apparatus  11  is configured to be able to pour the ink into the liquid container  34  in a state where the scanner unit  14  is open. 
     As illustrated in  FIG. 7 , a plurality of liquid containers  34  corresponding to a plurality of colors are loaded on the carriage  30 . A lid member  36  capable of opening and closing an inlet  35  (see  FIG. 3 ) for pouring liquid into a containing chamber  37  is provided at an upper part of each liquid container  34 . The lid member  36  opens and closes the inlet  35  by rotating substantially the rear side as an axis. The inlet  35  is positioned on downstream in the transport direction in the casing  12  of the liquid ejection apparatus  11 . 
     As illustrated in  FIG. 5 , the containing chamber  37  for storing liquid to be supplied to the liquid ejection head  20  includes, at least in part, a remaining amount checking section  37   a  formed of a material having transparency so that the remaining amount of liquid inside thereof can be visually recognized. The entire containing chamber  37  including the remaining amount checking section  37   a  positioned on the front side is formed of a transparent or semi-transparent resin material (plastics including polyethylene, polystyrene, and the like). 
     As illustrated in  FIG. 5 , a visual recognition section  30   a  through which the remaining amount checking section  37   a  of the containing chamber  37  can be visually recognized is provided in the carriage  30  on which the liquid container  34  including the containing chamber  37  is loaded. Specifically, as illustrated in  FIG. 7 , the carriage  30  has a box shape having an open upper part, and the liquid container  34  is loaded in a form in which the containing chamber  37  is accommodated in the box-shaped carriage  30 . The visual recognition section  30   a  is formed by partially cutting out a side surface on the apparatus front side of the carriage  30 . 
     As illustrated in  FIG. 7 , a notch  25  is provided on the front surface  12   a  of the casing  12 . In the ink pouring mode, the carriage  30  moves to a position that overlaps the notch  25  in the scanning direction. 
     As illustrated in  FIG. 3 , since the carriage  30  scans in the apparatus width direction, when the liquid ejection apparatus  11  is viewed from the width direction, even if the carriage  30  moves, the carriage  30  and the inlet  35  are always at the same position. In  FIG. 3 , the carriage  30  and the mounting portion  118  overlap in the vertical direction, the inlet  35  and the mounting portion  118  overlap in the vertical direction, and the carriage  30  and the substrate coupling portion  143  overlap in the vertical direction. 
     As illustrated in  FIGS. 4 and 5 , whether or not the carriage  30  and the inlet  35  are disposed so as to overlap the mounting portion  118  and the substrate coupling portion  143  in the vertical direction is determined by the position of the carriage  30 . In the figured ( FIGS. 4 and 5 ) of the liquid ejection apparatus  11  when viewed from the front of the apparatus, when the carriage  30  and the inlet  35  overlap the mounting portion  118  and the substrate coupling portion  143  (see  FIG. 9 ) in the vertical direction, the carriage  30  and the inlet  35  are disposed so as to overlap in the vertical direction. 
     As illustrated in  FIG. 5 , in the ink pouring mode, when liquid is poured from the inlet  35  (see  FIG. 3 ), the carriage  30  moves to a pouring position RP where the inlet  35  and the mounting portion  118  do not overlap in the vertical direction. In  FIG. 5 , positions of the five inlets  35  in the scanning direction are illustrated as inlet positions  35   a ,  35   b ,  35   c ,  35   d , and  35   e  from the home position HP side. In this embodiment, the carriage  30  moves to the pouring position RP where the inlet positions  35   a ,  35   b ,  35   c ,  35   d , and  35   e  do not overlap the mounting portion  118  in the vertical direction. That is, the carriage  30  moves to the pouring position RP where all the inlets  35  do not overlap the mounting portion  118  in the vertical direction. 
     As illustrated in  FIG. 5 , when a plurality of liquid containers  34  are loaded on the carriage  30  and liquid is poured from one inlet  35 , the carriage  30  may move to the pouring position RP where the one inlet  35  and the mounting portion  118  do not overlap in the vertical direction. 
     As illustrated in  FIG. 5 , in the ink pouring mode, when liquid is poured from the inlet  35  (see  FIG. 3 ), the carriage  30  is at a position that does not overlap the mounting portion  118  in the vertical direction. When the liquid is poured from the inlet  35 , the carriage  30  is at a position that does not overlap the substrate coupling portion  143  (see  FIG. 3 ) in the vertical direction. In this embodiment, when the carriage  30  is at the pouring position RP illustrated in  FIG. 5  where the user pours the liquid from the inlet  35  (see  FIG. 3 ), the carriage  30  is at a position that does not overlap the mounting portion  118  in the vertical direction. When the carriage  30  is at the pouring position RP illustrated in  FIG. 5 , the carriage  30  is at a position that does not overlap the substrate coupling portion  143  (see  FIG. 3 ) in the vertical direction. 
     Position Relation Between Components at Home Position 
     As illustrated in  FIG. 4 , when the liquid ejection head  20  moves to the home position HP, the liquid ejection head  20  is located on the right (−X-direction side of the right end RE of the transport path  40 ) outside of the transport path  40  in the scanning direction, and the carriage  30  is disposed at a position that overlaps the mounting portion  118  in the vertical direction. 
     As illustrated in  FIG. 4 , in this embodiment, since the length of the carriage  30  in the X-direction is longer than that of the mounting portion  118 , the mounting portion  118  entirely overlaps the carriage  30  in the vertical direction, and the carriage  30  is disposed at a position where the carriage  30  partially overlaps the mounting portion  118  in the vertical direction. 
     As illustrated in  FIG. 3 , the inlet  35  is provided on a downstream region in the transport direction in the casing  12 . As illustrated in  FIG. 4 , when the liquid ejection head  20  is outside the transport path  40  in the scanning direction, the inlet  35  is disposed at a position that overlaps the mounting portion  118  in the vertical direction. In this embodiment, as illustrated in  FIG. 4 , the first to third inlets from the home position HP side (the right end side in  FIG. 4 ) are disposed at positions that overlap the mounting portion  118  in the vertical direction. 
     As illustrated in  FIG. 4 , when the inlet  35  overlaps the mounting portion  118  in the vertical direction, an opening/closing inhibiting portion  24  inhibits opening and closing of the lid member  36 . In this embodiment, when the inlet positions  35   a ,  35   b , and  35   c  overlap the mounting portion  118  in the vertical direction, the opening/closing inhibiting portion  24  inhibits opening and closing of all the lid members  36 . That is, when the first to third inlets  35  from the home position HP side (the right end side in  FIG. 4 ) overlap the mounting portion  118  in the vertical direction, the opening/closing inhibiting portion  24  inhibits opening and closing of all the lid members  36 . 
     In this embodiment, when the carriage  30  stops at the home position HP, the opening/closing inhibiting portion  24  inhibits opening and closing of all the lid members  36 . At this time, at least one of the plurality of inlets  35  overlaps the mounting portion  118  in the vertical direction. In this way, a configuration in which, at the stop position of the carriage  30  where at least one inlet  35  overlaps the mounting portion  118  in the vertical direction, the opening/closing inhibiting portion  24  inhibits the user from pouring the ink into the liquid container  34  by inhibiting opening and closing of the lid member  36 , is adopted. 
     About Mounting of Waste Liquid Container 
     As illustrated in  FIG. 8 , the mounting portion  118  includes a discharge portion  141  that communicates with the discharge tube  135  (see  FIG. 3 ) to discharge waste liquid, a locking portion  142 , and a protruding portion  144  to which the substrate coupling portion  143  is attached. 
     As illustrated in  FIG. 9 , the locking portion  142  locks the waste liquid container  150  inserted into the mounting portion  118 . For example, the locking portion  142  is made of a leaf spring. The substrate coupling portion  143  is electrically coupled to the control section  200  (see  FIG. 3 ). The protruding portion  144  includes a pair of guide projections  144   a  that protrudes upward and downward. 
     As illustrated in  FIG. 8 , in the mounting portion  118 , the discharge portion  141  is disposed above the substrate coupling portion  143 . Below the discharge portion  141 , a step portion  149  extending in the mounting direction from the vicinity of the opening of the mounting portion  118  toward the depth side is provided. When the direction along the scanning direction is set as the width direction, the discharge portion  141  and the step portion  149  are disposed on the right side (−X-direction side) of a predetermined position (for example, the center) in the width direction, and the locking portion  142  and the protruding portion  144  are disposed on the left side (+X-direction side) of the predetermined position described above in the width direction. 
     As illustrated in  FIG. 9 , the waste liquid container  150  includes a bottomed box-shaped containing case  151  whose upper side is open in a state of being mounted to the mounting portion  118 , and a case lid  152  that covers the opening of the containing case  151 . 
     As illustrated in  FIG. 10 , the waste liquid container  150  has a substantially rectangular parallelepiped shape in which the mounting direction is a long side. The containing case  151  includes a handle portion  151   a  at an end portion on the front side in the mounting direction. When attaching and detaching the waste liquid container  150  to and from the mounting portion  118  (see  FIG. 9 ), the user places his/her hand on the handle portion  151   a , inserts the waste liquid container  150  into the mounting portion  118  (see  FIG. 9 ), and takes out the waste liquid container  150  from the mounting portion  118 . 
     As illustrated in  FIG. 11 , the containing case  151  includes a mounting surface  153  that is an outer surface on the depth side in the mounting direction, a bottom surface  154  that becomes a lower surface when mounted, and a pair of side surfaces  155  which are outer surfaces extending in a direction intersecting the width direction when the scanning direction is set as the width direction. The pair of side surfaces  155  are a first side surface  155 F and a second side surface  155 S. 
     As illustrated in  FIG. 11 , the waste liquid container  150  includes a circuit substrate  156  including a coupling terminal  156   a  that is electrically coupled to the substrate coupling portion  143  (see  FIG. 9 ) at the time of mounting to the mounting portion  118  (see  FIG. 9 ). In the circuit substrate  156 , information such as a containing amount of the waste liquid container  150  is stored. On the first side surface  155 F of the containing case  151 , an engagement projection  157  that engages with the locking portion  142  (see  FIG. 9 ) when inserted into the mounting portion  118  (see  FIG. 9 ) is projected. 
     As illustrated in  FIG. 12 , the waste liquid container  150  includes a waste liquid introduction portion  161  coupled to the discharge portion  141  at the time of mounting to the mounting portion  118 . The containing case  151  includes a recess  158  that opens to the mounting surface  153  and the first side surface  155 F and allows the protruding portion  144  to be inserted at the time of mounting to the mounting portion  118 , and a notch  159  that opens to at least the mounting surface  153  and the second side surface  155 S vertically below the waste liquid introduction portion  161 . 
     As illustrated in  FIG. 12 , in the containing case  151 , the notch  159  may be provided directly below the waste liquid introduction portion  161 . The recess  158  may be provided between a predetermined position (for example, the center) in the width direction and the first side surface  155 F, and the waste liquid introduction portion  161  and the notch  159  are preferably provided between a reference position and the second side surface  155 S in the width direction. The reference position is made to correspond to a reference position when the discharge portion  141  and the protruding portion  144  are disposed in the mounting portion  118 . 
     As illustrated in  FIG. 12 , the circuit substrate  156  is disposed in the recess  158  including the coupling terminal  156   a . In the recess  158 , guide grooves  158   a  engageable with the guide projection  144   a  of the protruding portion  144  are recessed above and below the circuit substrate  156 . The circuit substrate  156  is attached to the containing case  151  so that the coupling terminals  156   a  face the outside along the width direction in the recess  158 . The notch  159  is formed so as to extend from the mounting surface  153  in the taking-out direction. 
     Next, the operation of the liquid ejection apparatus  11  will be described. 
     When the liquid ejection apparatus  11  is not performing a printing operation, the carriage  30  is positioned at the home position HP, and the liquid ejection head  20  is in a state of being capped by the cap  131 . When receiving print data, the control section  200  starts the printing operation of the liquid ejection apparatus  11 . By rotation of the feed roller  26 , the uppermost one of the media P on the medium tray  21  is sent out. The sent out medium P is transported toward the recording section  18  via the outer periphery of the intermediate roller  27 . When the medium P passes through the recording position of the recording section  18 , the medium P is transported along the transport path  40  on the medium support member  33 . An image or a character based on print data is printed on the medium P by alternately and repeatedly performing a recording operation of performing recording for one scan on the medium P by ejecting liquid from the liquid ejection head  20  while the carriage  30  moves in the scanning direction and a transport operation of transporting the medium P to the next recording position. By performing the printing, liquid in the liquid container  34  is consumed. 
     When the cleaning time comes, the control section  200  performs cleaning in a state where the carriage  30  is positioned at the home position HP. When the carriage  30  is at the home position HP, the liquid ejection head  20  is positioned outside the transport path  40  in the scanning direction. The control section  200  moves the cap  131  from a retracted position to a capping position to form a closed space between the cap  131  and the liquid ejection head  20  where the nozzle communicates. The control section  200  forcibly sucks and discharges the liquid from the nozzles by driving the suction pump  134  to introduce negative pressure into the cap  131 . The liquid discharged from the liquid ejection head  20  by this cleaning is collected in the waste liquid container  150  through the cap  131  and the discharge tube  135  as waste liquid. The control section  200  performs idle ejection (flushing) in which the carriage  30  is periodically moved to the home position HP during printing to eject liquid from the liquid ejection head  20  to the cap  131 . The waste liquid remaining in the cap  131  due to multiple idle ejections is collected in the waste liquid container  150  through the discharge tube  135  by idle suction performed by driving the suction pump  134 . The liquid in the liquid container  34  is also consumed by maintenance including this cleaning. 
     As illustrated in  FIG. 4 , by disposing the maintenance mechanism  130  and the mounting portion  118  at positions where the maintenance mechanism  130  and the mounting portion  118  overlap in the vertical direction, the length in the width direction required outside the transport path  40  in the scanning direction on the side where the mounting portion  118  is mounted is reduced compared to the case where the maintenance mechanism  130  and the mounting portion  118  are disposed at positions where the maintenance mechanism  130  and the mounting portion  118  do not overlap. That is, the length in the width direction of the liquid ejection apparatus  11  can be reduced. 
     As illustrated in  FIG. 4 , when performing the cleaning operation of the liquid ejection head  20  or performing the capping operation to prevent the nozzle  120  of the liquid ejection head  20  from drying, the carriage  30  is positioned at the home position HP where the liquid ejection head  20  is outside the transport path  40  in the scanning direction. 
     A plurality of liquid containers  34  corresponding to a plurality of colors are loaded on the carriage  30  side by side in the scanning direction, and when the carriage  30  moves to a position where all the ejection positions of the liquid ejection heads  20  are positioned outside the transport path  40  in the scanning direction, at least half of the length of the carriage  30  in the scanning direction is positioned outside the transport path  40  in the scanning direction. For that reason, when the liquid ejection head  20  is positioned outside the transport path  40  in the scanning direction, the carriage  30  is disposed at a position that overlaps the mounting portion  118  in the vertical direction, so that the space outside the transport path  40  in the scanning direction is smaller than when the carriage  30  is disposed at a position that does not overlap the mounting portion  118 . Therefore, the length dimension in the width direction of the portion of the liquid ejection apparatus  11  outside the transport path  40  in the scanning direction is short. 
     As illustrated in  FIG. 2 , the length of the liquid ejection apparatus  11  in the depth direction requires a length for placing the medium P on the medium tray  21 , and there is room for space. As illustrated in  FIG. 3 , in order to load the waste liquid container  150  which is detachably mounted to the liquid ejection apparatus  11 , the liquid ejection head  20  is disposed on the apparatus rear side of the carriage  30 . Then, while maintaining the condition that the cap  131  is positioned directly below the liquid ejection head  20 , the mounting portion  118  is disposed in an accommodation space secured in front of the apparatus by retracting the maintenance mechanism  130  to the apparatus rear side. Therefore, the depth dimension of the waste liquid container  150  mounted to the mounting portion  118  can be secured long, and thus the width dimension required for the waste liquid container  150  is relatively short. Then, in this embodiment, when the carriage  30  is at the home position HP, the outer end surface of the mounting portion  118  is positioned inside the outer end surface of the carriage  30  in the scanning direction. Also from this point, the liquid ejection apparatus  11  does not increase in size in the width direction X. 
     As illustrated in  FIG. 2 , in order to allow the user to pull out the medium tray  21  when replenishing the medium P to the medium tray  21 , a work space is secured in front of the apparatus, which is downstream in the transport direction in the casing  12 . Since the medium P after recording is stacked on the discharge tray  22 , the work space is secured in front of the apparatus, which is downstream in the transport direction outside the casing  12 . In this embodiment, the waste liquid container  150  can be attached to and detached from the mounting portion  118  from downstream (front surface  12   a  side) in the transport direction of the casing  12 . For that reason, a work space required when removing the waste liquid container  150  is not required outside in the scanning direction (width direction) of the liquid ejection apparatus  11  and upstream in the transport direction outside the casing  12 . That is, the waste liquid container  150  can be attached and detached at the time of replacement or the like by using the medium tray  21  and the work space secured in front of the apparatus for attaching and detaching the medium tray  21 . 
     When the printing operation is repeated, ink is consumed by printing. When the remaining amount of the ink falls below a threshold value, notification is given on the operation surface  16   a  that the remaining amount of the ink is low. When the user issues an instruction to pour ink through the operation surface  16   a , the liquid ejection apparatus  11  enters the ink pouring mode, and the carriage  30  moves from the home position HP to the pouring position RP (see  FIG. 7 ) and stops. 
     As illustrated in  FIG. 7 , when the user opens the scanner unit  14 , the user checks that the carriage  30  has stopped at the pouring position RP (see  FIG. 7 ). In a state where the scanner unit  14  is opened, the panel unit  23  is held at an angle at which the user can easily view the operation surface  16   a  of the operation section  16 . The user can satisfactorily read a message displayed on the operation surface  16   a  when pouring the ink into the liquid container  34 . 
     As illustrated in  FIG. 7 , the notch  25  is provided on the front surface  12   a  of the casing  12 . The pouring position RP is a position where the carriage  30  overlaps the notch  25  in the scanning direction. By providing the visual recognition section  30   a  on the carriage  30 , the user views the remaining amount checking section  37   a  (see  FIG. 5 ) in a state where the containing chamber  37  is loaded on the carriage  30 . Since none of the lid members  36  are covered by the opening/closing inhibiting portion  24 , the user can open any of the lid members  36 . The user opens the lid member  36  for which notification that the remaining amount is small is given and pours ink in the liquid container  34  from the liquid replenishing container into the containing chamber  37  while checking an amount of the ink. 
     Since the inlet  35  is provided on a downstream region in the transport direction in the casing  12  of the liquid ejection apparatus  11 , when the user pours the liquid in the liquid replenishing container into the containing chamber  37 , there is little possibility that the liquid replenishing container hits the scanner unit  14  or the panel unit  23 . Even if the liquid replenishing container hits the scanner unit  14  or the panel unit  23 , the user can pour the liquid in the liquid replenishing container into the containing chamber  37  simply by slightly tilting the liquid replenishing container from an overturned posture. Since the inlet  35  is provided on a downstream region in the transport direction in the casing  12  of the liquid ejection apparatus  11 , the user can pour ink while checking the amount of ink in the liquid container  34 . The user can perform the ink pouring work at the wide opening near the front of an upper surface opening of the casing  12 , so that the ink pouring work is easy. 
     As illustrated in  FIG. 5 , a plurality of liquid containers  34  loaded on the liquid ejection apparatus  11 . When the carriage  30  is at the pouring position RP, all the inlet positions  35   a ,  35   b ,  35   c ,  35   d , and  35   e  and the mounting portion  118  are disposed at positions where the inlet positions  35   a ,  35   b ,  35   c ,  35   d , and  35   e  and the mounting portion  118  do not overlap in the vertical direction, ink dripping from the inlet (see  FIG. 3 ) does not adhere to the mounting portion  118 . Since the carriage  30  and the mounting portion  118  are disposed at positions where the carriage  30  and the mounting portion  118  do not overlap in the vertical direction, ink dripping from the carriage  30  does not adhere to the mounting portion  118 . Since the carriage  30  and the substrate coupling portion  143  are disposed at positions where the carriage  30  and the substrate coupling portion  143  do not overlap in the vertical direction, ink dripping from the carriage  30  does not adhere to the substrate coupling portion  143 . 
     The liquid container  34  may include a remaining amount detection section capable of detecting that the amount of liquid contained in the containing chamber  37  has fallen below a first threshold. The liquid container  34  may include a full detection section capable of detecting that the liquid is further poured into the containing chamber  37  and the amount of the liquid in the containing chamber  37  has reached a second threshold larger than the first threshold. 
     As illustrated in  FIG. 7 , since the visual recognition section  30   a  is provided on the side surface on the front side of the carriage  30 , the user can easily see the remaining amount checking section  37   a  (see  FIG. 5 ). Since the containing chamber  37  is provided at a position above the liquid ejection head  20 , the remaining amount checking section  37   a  (see  FIG. 5 ) and the visual recognition section  30   a  are necessarily positioned above the liquid ejection head  20 , so that the user&#39;s line of sight when viewing the remaining amount of liquid is also increased, and visibility is further improved. 
     When the pouring of ink is completed, the user closes the lid member  36 , closes the scanner unit  14 , and operates the operation section  16  to end the ink pouring mode. When the ink pouring mode is ended, the carriage  30  returns to the home position HP. There is a sensor (not illustrated) that detects that the scanner unit  14  is closed, and when the sensor detects the closed state of the scanner unit  14 , the control section  200  drives a carriage motor  170  (see  FIG. 3 ), and the carriage  30  moves to the home position HP. 
     When the lid member  36  is not closed, the carriage  30  may not be able to move to the home position HP. For example, if the lid member  36  comes into contact with the opening/closing inhibiting portion  24  when the lid member  36  is not closed, the control section  200  (see  FIG. 3 ) detects driving load of the carriage motor  170  (see  FIG. 3 ) and stops the carriage motor  170 . That is, the carriage  30  may be stopped at a position where the lid member  36  contacts the opening/closing inhibiting portion  24 . At this time, the liquid ejection apparatus  11  may notify the operation surface  16   a  of information indicating that the lid member  36  is not closed and information that prompts the user to close the lid member  36 . 
     As illustrated in  FIG. 6 , the scanner unit  14  is opened when a jammed medium P is removed from the transport path  40  when a jam occurs during printing, for example. As described above, the scanner unit  14  can be opened during a non-printing operation in which a printing operation is not performed, including during an emergency stop. For example, the user may open the scanner unit  14  when the liquid ejection apparatus  11  is not printing. In this case, the carriage  30  normally stops at the home position HP (see  FIG. 6 ). 
     As illustrated in  FIGS. 4 and 6 , when the carriage  30  is positioned at the home position HP, the user cannot open the lid member  36  because all the lid members  36  are covered by the opening/closing inhibiting portion  24 . That is, at the position of the carriage  30  when the inlet positions  35   a ,  35   b , and  35   c  overlap the mounting portion  118  in the vertical direction, the opening/closing inhibiting portion  24  inhibits opening and closing of the lid member  36 . Therefore, in a state where the carriage  30  is positioned at the home position HP and the inlet positions  35   a ,  35   b , and  35   c  overlap the mounting portion  118  in the vertical direction, the user cannot open the lid member  36  by the opening/closing inhibiting portion  24 . That is, when the carriage  30  is at the home position HP, the user cannot pour ink into the liquid container  34 . As a result, it is possible to avoid liquid dripping onto the mounting portion  118  and the waste liquid container  150 , which is caused by an action of the user pouring the ink into the liquid container  34  when the carriage  30  is at the home position HP. 
     As illustrated in  FIG. 3 , when the liquid ejection apparatus  11  executes a maintenance operation such as cleaning, waste liquid discharged from the liquid ejection head  20  is introduced into the waste liquid container  150  through the discharge portion  141  (see  FIG. 8 ) and the waste liquid introduction portion  161  (see  FIG. 12 ). The control section  200  subtracts the stored containing amount of the waste liquid container  150  by an amount of the discharged waste liquid, and stores a value indicating the subtracted containing amount in the circuit substrate  156  (see FIG.  12 ). When there is space available for the containing amount of waste liquid in the waste liquid container  150 , the control section  200  allows introduction of the waste liquid into the waste liquid container  150 . When the containing amount of the waste liquid container  150  is almost full, the control section  200  issues a notification to the effect that the waste liquid container  150  is to be replaced through the operation surface  16   a  (see  FIG. 1 ). 
     As illustrated in  FIG. 3 , when the lower cover  17  is disposed at the open position, the containing body cover  117  detachably mounted to the casing  12  is exposed. The user removes the containing body cover  117 , puts his hand on the handle portion  151   a  of the waste liquid container  150 , pulls the waste liquid container  150  being full forward from the mounting portion  118 , and removes the waste liquid container  150  from the liquid ejection apparatus  11 . Since no ink has adhered to the mounting portion  118  and the substrate coupling portion  143 , no ink has also adhered to the waste liquid container  150 , which is mounted in a state of being inserted into the box-shaped mounting portion  118  having an open front surface, as well. Therefore, the user does not need to stain his hands with ink. 
     As illustrated in  FIG. 9 , the mounting portion  118  is at a position where the waste liquid container  150  can be mounted detachably from the apparatus front side. The direction in which the user removes the waste liquid container  150  from the mounting portion  118  is the same as the direction in which the user pulls out the discharge tray  22  (see  FIG. 2 ), and the direction is the same as the direction in which the user pulls out the medium tray  21  when the user replenishes the medium tray  21  with the medium P. In addition to the operation of the medium tray  21  and the discharge tray  22 , both the inlet  35  and the mounting portion  118  are at positions where the user in front of the liquid ejection apparatus  11  can operate. 
     As illustrated in  FIG. 9 , the user replaces the waste liquid container  150  being full with an unused waste liquid container  150 . When the user moves the unused waste liquid container  150  in the mounting direction with respect to the mounting portion  118 , the locking portion  142  is engaged with the engagement projection  157 , and the movement of the waste liquid container  150  in the taking-out direction is regulated. 
     By moving the waste liquid container  150  in the mounting direction, the discharge portion  141  (see  FIG. 8 ) is coupled to the waste liquid introduction portion  161  of the waste liquid container  150 , the coupling terminal  156   a  of the circuit substrate  156  comes into contact with the substrate coupling portion  143 , and the circuit substrate  156  and the control section  200  (see  FIG. 3 ) are electrically coupled. At this time, the guide projection  144   a  of the protruding portion  144  is engaged with the guide groove  158   a  of the waste liquid container  150 , so that the coupling terminal  156   a  of the circuit substrate  156  is accurately positioned with respect to the substrate coupling portion  143 . The control section  200  (see  FIG. 3 ) detects that the waste liquid container  150  is mounted by being electrically coupled to the circuit substrate  156 . When the mounting of the waste liquid container  150  is not detected even after the lapse of a predetermined time from the removal of the waste liquid container  150 , the control section  200  notifies the user of the fact by displaying information indicating that the mounting is not detected and information such as a message urging the user to mount the waste liquid container  150  on the operation surface  16   a.    
     According to the embodiment described above, the following effects can be obtained. 
     (1) The mounting portion  118  is outside the transport path  40  in the scanning direction and downstream in the transport direction in the casing  12 , and when the liquid ejection head  20  is outside the transport path  40  in the scanning direction, the carriage  30  is disposed at a position that overlap the mounting portion  118  in the vertical direction. Since the length in the width direction outside the transport path  40  in the scanning direction does not increase, the overall length of the liquid ejection apparatus  11  in the width direction does not become larger than that of the liquid ejection apparatus having a configuration in which the carriage does not overlap the mounting portion in the vertical direction when the liquid ejection head  20  is outside the transport path  40  in the scanning direction. That is, even if the mounting portion  118  and the waste liquid container  150  are disposed, the mounting area of the liquid ejection apparatus  11  when placed on a desk or floor does not need to be large. The mounting portion  118  is provided outside the transport path  40  in the scanning direction and downstream in the transport direction in the casing  12 , and thus has good operability when attaching and detaching the waste liquid container  150 . 
     (2) The mounting portion  118  is configured to attach and detach the waste liquid container  150  to and from downstream in the transport direction of the casing  12 . The user can remove the waste liquid container  150  from the front of the apparatus, which is downstream in the transport direction of the casing  12 . The direction in which the user removes the waste liquid container  150  is the same as the direction in which the discharge tray  22  extends from the casing  12 , the direction is the same as the direction in which the user pulls out the discharge tray  22 , and the direction is the same as the direction in which the user pulls out the medium tray  21  when the user replenishes the medium tray  21  with the medium P. The user also operates the operation surface  16   a  from the front of the apparatus. A space is already secured at the front of the apparatus which is downstream in the transport direction of the casing  12 , and a new work space is not required. Therefore, the mounting area of the liquid ejection apparatus  11  does not need to be large, and an occupied space including the working space does not need to be large. 
     (3) Both the inlet  35  and the mounting portion  118  are at positions that can be operated by the user. When the user pours the liquid from the inlet  35 , the pouring operation can be performed from the front of the apparatus, which is downstream in the transport direction of the casing  12 . When the user mounts the waste liquid container  150  to the mounting portion  118 , the mounting operation can be performed from the front of the apparatus, which is downstream in the transport direction of the casing  12 . When the user takes out the waste liquid container  150  from the mounting portion  118 , the taking-out operation can be performed from the front of the apparatus, which is downstream in the transport direction of the casing  12 . In addition to the operation of the medium tray  21  and the discharge tray  22 , the user can perform both the operation of pouring the liquid from the inlet  35  and the operation of attaching and detaching the waste liquid container  150  to and from the mounting portion  118  from the front of the apparatus, which is downstream in the transport direction of the casing  12 , and workability of the user is improved. Since all operations can be performed from the front of the apparatus, the degree of freedom of the installation place is increased. 
     (4) When the user pours liquid from the inlet  35 , the liquid may be spilled from the inlet  35 . When the liquid moves in the vertical direction along the surface of the carriage  30  due to gravity by using a portion extending from the one inlet  35  to the carriage  30  as a path, the liquid does not reach the mounting portion  118 . The mounting portion  118  is connected to the waste liquid container  150 . That is, it is possible to suppress that the liquid adheres to the waste liquid container  150  handled by the user. 
     (5) In a case where a plurality of liquid containers  34  are loaded on the liquid ejection apparatus  11 , when the user pours liquid from one inlet  35 , the liquid may be spilled from the one inlet  35 . When the liquid moves in the vertical direction along the surface of the carriage  30  due to gravity by using a portion extending from the inlet  35  to the carriage  30  as a path, the liquid does not reach the mounting portion  118 . The waste liquid container  150  is mounted to the mounting portion  118 . That is, it is possible to suppress that the liquid adheres to the waste liquid container  150  handled by the user. 
     (6) When the user pours liquid from the inlet  35 , the liquid may be spilled from the inlet  35 . When the liquid moves in the vertical direction along the surface of the carriage  30  due to gravity and in the horizontal direction (in the XY plane) along the surface of the carriage  30  due to wettability by using a portion extending from the inlet  35  to the carriage  30  as a path, the liquid does not reach the substrate coupling portion  143 . The substrate coupling portion  143  is connected to the waste liquid container  150 . That is, it is possible to suppress that the liquid adheres to the waste liquid container  150  handled by the user. 
     (7) When the user pours liquid from the inlet  35 , the liquid may be spilled from the inlet  35 . When the liquid moves in the vertical direction along the surface of the carriage  30  due to gravity and in the horizontal direction (in the XY plane) along the surface of the carriage  30  due to wettability by using a portion extending from the inlet  35  to the carriage  30  as a path, the liquid does not reach the mounting portion  118 . The waste liquid container  150  is mounted to the mounting portion  118 . That is, it is possible to suppress that the liquid adheres to the waste liquid container  150  handled by the user. 
     (8) At the position where the opening/closing inhibiting portion  24  inhibits opening and closing of the lid member  36 , the user cannot open the lid member  36  whose opening and closing is inhibited. That is, the user is prevented from pouring the liquid at a position where the liquid dripped during the pouring may adhere to the waste liquid container  150 . 
     Second Embodiment 
     Next, a second embodiment of the liquid ejection apparatus will be described with reference to  FIGS. 13 and 14 . As illustrated in  FIG. 13 , the second embodiment is different from the first embodiment in that the home position HP is at a position opposite to the home position HP (see  FIG. 4 ) in the first embodiment in the width direction. The second embodiment is different from the first embodiment in that the mounting portion  118  is disposed on the left outside of the transport path  40  (+X side of the left end LE of the transport path  40 ) in the scanning direction. The other points are substantially the same as those of the first embodiment, and thus the same configurations are denoted by the same reference numerals, and the duplicate description will be omitted. 
     As illustrated in  FIG. 13 , when the liquid ejection head  20  moves to the home position HP, the liquid ejection head  20  is outside the home position HP side of the transport path  40  in the scanning direction, and the carriage  30  is disposed at a position overlaps the mounting portion  118  in the vertical direction. 
     As illustrated in  FIG. 9 , the waste liquid container  150  that contains liquid as waste liquid discharged from the liquid ejection head  20  is detachably mounted to the mounting portion  118  from the apparatus front side, which is downstream in the transport direction of the casing  12 . However, the mounting portion  118  is on the right outside of the transport path  40  in the first embodiment (see  FIG. 9 ), whereas the mounting portion  118  is on the left outside of the transport path  40  in the second embodiment, and thus the left and right of the mounting portion  118  in  FIG. 9  are inverted in  FIG. 13  of the second embodiment. Similarly, the left and right of the waste liquid container  150  of  FIG. 10  are inverted in  FIG. 13  of the second embodiment. 
     As illustrated in  FIG. 3 , the inlet  35  is provided downstream in the transport direction in the casing  12 . As illustrated in  FIG. 13 , when the liquid ejection head  20  is outside the transport path  40  in the scanning direction, the inlet  35  is disposed at a position that overlaps the mounting portion  118  in the vertical direction. 
     As illustrated in  FIG. 14 , when pouring liquid from the inlet  35  (not illustrated), the carriage  30  moves to the pouring position RP where the one inlet  35  and the mounting portion  118  do not overlap in the vertical direction. In  FIG. 14 , the positions on the X-axis of the five inlets  35  are illustrated as the inlet positions  35   a ,  35   b ,  35   c ,  35   d , and  35   e  from the opposite home position side. In this embodiment, the carriage  30  moves to the pouring position RP where the inlet positions  35   a ,  35   b ,  35   c ,  35   d , and  35   e  do not overlap the mounting portion  118  in the vertical direction. That is, the carriage  30  moves to the pouring position RP where all the inlets  35  do not overlap the mounting portion  118  in the vertical direction. 
     As illustrated in  FIG. 14 , a plurality of liquid containers  34  are loaded on the carriage  30 , and when pouring liquid from one inlet  35 , the carriage  30  may move to the pouring position RP where the one inlet  35  and the mounting portion  118  do not overlap in the vertical direction. 
     As illustrated in  FIGS. 9 and 10 , the mounting portion  118  (see  FIG. 9 ) includes the substrate coupling portion  143  (see  FIG. 9 ) that is electrically coupled to the circuit substrate  156  (see  FIG. 11 ) provided in the waste liquid container  150  (see  FIG. 10 ). However, the mounting portion  118  is on the right outside of the transport path  40  in the first embodiment (see  FIG. 9 ), whereas the mounting portion  118  is on the left outside of the transport path  40  in the second embodiment, and thus the left and right of the mounting portion  118  in  FIG. 9  are inverted in  FIG. 14  of the second embodiment. Similarly, the left and right of the waste liquid container  150  of  FIG. 10  are inverted in  FIG. 14  of the second embodiment. 
     As illustrated in  FIG. 14 , the pouring position RP is a position where the carriage  30  does not overlap the substrate coupling portion  143  in the vertical direction (see  FIG. 9 ). The pouring position RP is a position where the carriage  30  does not overlap the mounting portion  118  in the vertical direction. 
     As illustrated in  FIG. 13 , when the inlet  35  overlaps the mounting portion  118  in the vertical direction, the opening/closing inhibiting portion  24  inhibits opening and closing of the lid member  36 . In this embodiment, when the inlet positions  35   c ,  35   d , and  35   e  overlap the mounting portion  118  in the vertical direction, the opening/closing inhibiting portion  24  inhibits opening and closing of all the lid members  36 . That is, when the first to third inlets from the home position HP side overlap the mounting portion  118  in the vertical direction, the opening/closing inhibiting portion  24  inhibits opening and closing of all the lid members  36 . 
     According to the second embodiment, the same operation and the same effects (1) to (8) as in the first embodiment can be obtained. 
     Third Embodiment 
     Next, a third embodiment of the liquid ejection apparatus will be described with reference to  FIGS. 15 and 16 . As illustrated in  FIG. 15 , the third embodiment is different from the first embodiment in that the mounting portion  118  is disposed on the left (+X side of the left end LE of the transport path  40 ) outside of the transport path  40  in the scanning direction. The other points are substantially the same as those of the first embodiment, and thus the same configurations are denoted by the same reference numerals and the duplicate description will be omitted. 
     As illustrated in  FIG. 15 , when the liquid ejection head  20  moves to the opposite home position side, the liquid ejection head  20  is outside the opposite home position side of the transport path  40  in the scanning direction, and the carriage  30  is disposed at a position that overlaps the mounting portion  118  in the vertical direction. 
     As illustrated in  FIG. 9 , the waste liquid container  150  that contains liquid as waste liquid discharged from the liquid ejection head  20  is detachably mounted to the mounting portion  118  from the apparatus front side, which is downstream in the transport direction of the casing  12 . However, the mounting portion  118  is on the right outside of the transport path  40  in the scanning direction in the first embodiment (see  FIG. 9 ), whereas the mounting portion  118  is on the left outside of the transport path  40  in the scanning direction in the third embodiment, and thus the left and right of the mounting portion  118  in  FIG. 9  are inverted in  FIG. 15  of the third embodiment. Similarly, the left and right of the waste liquid container  150  of  FIG. 10  are inverted in  FIG. 15  of the third embodiment. 
     As illustrated in  FIG. 3 , the inlet  35  is provided on a downstream region in the transport direction in the casing  12 . As illustrated in  FIG. 15 , when the liquid ejection head  20  is outside the transport path  40  in the scanning direction (when the carriage  30  is at the position indicated by the two-dot chain line in  FIG. 15 ), the inlet  35  is disposed at a position that overlaps the mounting portion  118  in the vertical direction. 
     As illustrated in  FIG. 16 , when pouring liquid from the inlet  35  (not illustrated), the carriage  30  moves to the pouring position RP where the inlet  35  and the mounting portion  118  do not overlap in the vertical direction. In  FIG. 16 , the positions on the X-axis of the five inlets  35  are illustrated as the inlet positions  35   a ,  35   b ,  35   c ,  35   d , and  35   e  from the home position HP side. In this embodiment, the carriage  30  moves to the pouring position RP where the inlet positions  35   a ,  35   b ,  35   c ,  35   d , and  35   e  do not overlap the mounting portion  118  in the vertical direction. That is, the carriage  30  moves to the pouring position RP where all the inlets  35  do not overlap the mounting portion  118  in the vertical direction. 
     As illustrated in  FIG. 16 , a plurality of liquid containers  34  are loaded on the carriage  30 , and when pouring liquid from one inlet  35 , the carriage  30  may move to the pouring position RP where the one inlet  35  and the mounting portion  118  do not overlap in the vertical direction. 
     As illustrated in  FIGS. 9 and 10 , the mounting portion  118  (see  FIG. 9 ) includes the substrate coupling portion  143  (see  FIG. 9 ) that is electrically coupled to the circuit substrate  156  (see  FIG. 11 ) provided in the waste liquid container  150  (see  FIG. 10 ). However, the mounting portion  118  is on the right outside of the transport path  40  in the scanning direction in the first embodiment (see  FIG. 9 ), whereas the mounting portion  118  is on the left outside of the transport path  40  in the scanning direction in the third embodiment, and thus the left and right of the mounting portion  118  in  FIG. 9  are inverted in  FIG. 16  of the third embodiment. Similarly, the left and right of the waste liquid container  150  of  FIG. 10  are inverted in FIG.  16  of the third embodiment. 
     As illustrated in  FIG. 16 , the pouring position RP is a position where the carriage  30  does not overlap the substrate coupling portion  143  (see  FIG. 9 ) in the vertical direction. The pouring position RP is a position where the carriage  30  does not overlap the mounting portion  118  in the vertical direction. 
     As illustrated in  FIG. 15 , when the inlet  35  overlaps the mounting portion  118  in the vertical direction, the opening/closing inhibiting portion  24  inhibits opening and closing of the lid member  36 . In this embodiment, when the inlet positions  35   c ,  35   d , and  35   e  overlap the mounting portion  118  in the vertical direction, the opening/closing inhibiting portion  24  inhibits opening and closing of all the lid members  36 . That is, when the first to third inlets from the opposite home position side overlap the mounting portion  118  in the vertical direction, the opening/closing inhibiting portion  24  inhibits opening and closing of all the lid members  36 . 
     According to the third embodiment, the same operation and the same effects (1) to (8) as in the first embodiment can be obtained. 
     Fourth Embodiment 
     Next, a fourth embodiment of the liquid ejection apparatus will be described with reference to  FIGS. 17  and  18 . As illustrated in  FIG. 17 , the fourth embodiment is different from the first embodiment in that the home position HP is at a position opposite to the home position HP (see  FIG. 4 ) in the first embodiment in the width direction. The other points are substantially the same as those of the first embodiment, and thus the same configurations are denoted by the same reference numerals, and the duplicate description will be omitted. 
     As illustrated in  FIG. 17 , when the liquid ejection head  20  moves to the opposite home position side, the liquid ejection head  20  is outside the opposite home position side of the transport path  40  in the scanning direction, and the carriage  30  is disposed at a position that overlaps the mounting portion  118  in the vertical direction. 
     As illustrated in  FIG. 9 , the waste liquid container  150  that contains liquid as waste liquid discharged from the liquid ejection head  20  is detachably mounted to the mounting portion  118  from the apparatus front side, which is downstream in the transport direction of the casing  12 . 
     As illustrated in  FIG. 3 , the inlet  35  is provided downstream in the transport direction in the casing  12 . As illustrated in  FIG. 17 , when the liquid ejection head  20  is outside the transport path  40  in the scanning direction, that is, when the carriage  30  is at the position indicated by the two-dot chain line in  FIG. 17 , the inlet  35  is disposed at a position that overlaps the mounting portion  118  in the vertical direction. 
     As illustrated in  FIG. 18 , when pouring liquid from the inlet  35 , the carriage  30  moves to the pouring position RP where the one inlet  35  and the mounting portion  118  do not overlap in the vertical direction. In  FIG. 18 , the positions on the X-axis of the five inlets  35  are illustrated as the inlet positions  35   a ,  35   b ,  35   c ,  35   d , and  35   e  from the home position HP side. In this embodiment, the carriage  30  moves to the pouring position RP where the inlet positions  35   a ,  35   b ,  35   c ,  35   d , and  35   e  do not overlap the mounting portion  118  in the vertical direction. That is, the carriage  30  moves to the pouring position RP where all the inlets  35  do not overlap the mounting portion  118  in the vertical direction. 
     As illustrated in  FIG. 18 , a plurality of liquid containers  34  are loaded on the carriage  30 , and when pouring liquid from one inlet  35 , the carriage  30  may move to the pouring position RP where the one inlet  35  and the mounting portion  118  do not overlap in the vertical direction. 
     As illustrated in  FIGS. 9 and 10 , the mounting portion  118  (see  FIG. 9 ) includes the substrate coupling portion  143  (see  FIG. 9 ) that is electrically coupled to the circuit substrate  156  (see  FIG. 11 ) provided in the waste liquid container  150  (see  FIG. 10 ). 
     As illustrated in  FIG. 18 , the pouring position RP is at a position where the carriage  30  does not overlap the substrate coupling portion  143  in the vertical direction (see  FIG. 9 ). The pouring position RP is a position where the carriage  30  does not overlap the mounting portion  118  in the vertical direction. 
     As illustrated in  FIG. 17 , when the inlet  35  overlaps the mounting portion  118  in the vertical direction, the opening/closing inhibiting portion  24  inhibits opening and closing of the lid member  36 . In this embodiment, when the inlet positions  35   a ,  35   b , and  35   c  overlap the mounting portion  118  in the vertical direction, the opening/closing inhibiting portion  24  inhibits opening and closing of all the lid members  36 . That is, when the first to third inlets from the opposite home position side overlap the mounting portion  118  in the vertical direction, the opening/closing inhibiting portion  24  inhibits opening and closing of all the lid members  36 . 
     According to the fourth embodiment, the same operation and the same effects (1) to (8) as in the first embodiment can be obtained. 
     The embodiments described above can be modified to a form such as the following modification examples. Furthermore, a combination of the embodiments described above and the following modification examples may also be a further modification example, or a combination of the following modification examples may also be a further modification example.
         In the first embodiment, in addition to the cap  131  included in the maintenance mechanism  130 , another cap may be provided on the left outside of the transport path  40 , and the position of the cap may be set as the home position HP of the liquid ejection head  20 . The cap is also configured to be movable between an open position separated from the liquid ejection head  20  and a capping position surrounding the nozzle  120  and contacting the liquid ejection head  20  by the urging force of the urging member  136 . The purpose of the cap is to prevent the nozzle from drying. The liquid ejection head  20  is periodically moved to the right side of the apparatus outside the transport path  40  in the scanning direction, which is the position of the cap  131  included in the maintenance mechanism  130 , and cleaning is performed.   In the second embodiment, in addition to the cap  131  included in the maintenance mechanism  130 , another cap may be provided on the right outside of the transport path  40 , and the position of the cap may be set as the home position HP of the liquid ejection head  20 . The cap is also configured to be movable between the open position separated from the liquid ejection head  20  and the capping position surrounding the nozzle  120  and contacting the liquid ejection head  20  by the urging force of the urging member  136 . The purpose of the cap is to prevent the nozzle from drying. The liquid ejection head  20  is periodically moved to the left outside of the transport path  40 , which is the position of the cap  131  included in the maintenance mechanism  130 , and cleaning is performed.   If the waste liquid container  150  is detachably mounted to the mounting portion  118 , the mounting portion  118  does not need to be box-shaped. The surface of the mounting portion  118  corresponding to the case lid  152  of the waste liquid container  150  may not be provided, or the surface of the mounting portion  118  corresponding to the first side surface  155 F or the second side surface  155 S may not be provided.   The inlets  35  does not need to be aligned in the scanning direction. The inlets  35  may be disposed by being shifted in the transport direction or may be alternately disposed. The liquid containers  34  may be disposed side by side in the transport direction and the inlets  35  may be aligned in the transport direction. The inlets  35  do not need to be aligned in the transport direction, may be disposed by being shifted in the scanning direction, or may be alternately disposed.   All the liquid containers  34  do not need to have the same size. The size of the liquid container  34  may be increased by increasing the length of the liquid container for the liquid, of which use amount is large, in the scanning direction. The size of the liquid container  34  may be changed by increasing the length of the liquid container for the liquid, of which use amount is large, in the transport direction. The size of the liquid container for the liquid of which use amount is small may be reduced. By changing the size of the liquid container  34 , the pitch of the inlet  35  in the scanning direction may be changed, or the pitch may not be constant.   In the first embodiment, the waste liquid container  150  may be detachably mounted from the right side surface of the apparatus on the home position HP side.   In the second embodiment, the waste liquid container  150  may be detachably mounted from the left side surface of the apparatus on the home position HP side.   In the third embodiment, the waste liquid container  150  may be detachably mounted from the left side surface of the apparatus on the opposite home position side.   In the fourth embodiment, the waste liquid container  150  may be detachably mounted from the right side surface of the apparatus on the opposite home position side.   The user inserts a supply port portion of the liquid replenishing container into the inlet  35  and pours the liquid in the liquid replenishing container into the containing chamber  37 . If the inlet  35  is provided on the front side than a half position in the transport direction of the liquid ejection apparatus  11 , when the liquid in the liquid replenishing container is poured into the containing chamber  37 , there is little possibility that the liquid replenishing container hits the scanner unit  14  or the panel unit  23 . Even if the liquid replenishing container hits the unit, the liquid in the liquid replenishing container can be poured into the containing chamber  37  only by slightly inclining the liquid replenishing container, and thus there is little possibility of spilling ink. The inlet  35  may be positioned anywhere in the liquid container  34  as long as it is provided downstream in the transport direction of the liquid ejection apparatus  11 . Further, as long as the ink pouring work is not hindered, the inlet  35  is not limited to downstream in the transport direction of the liquid ejection apparatus  11 , and may be on the front side or the rear side of the liquid container  34 .   As illustrated in  FIGS. 5, 14, 16, and 18 , the pouring position RP of the carriage  30  when pouring the liquid from the inlet  35  may be anywhere as long as the inlet  35  and the mounting portion  118  do not overlap in the vertical direction. The pouring position RP may be positioned closer to the opposite home position side than the positions illustrated in the figures, or may be positioned closer to the home position HP side than the positions illustrated in the figures.   As illustrated in  FIGS. 5, 14, 16, and 18 , when a plurality of liquid containers  34  are loaded on the carriage  30 , the pouring position RP of the carriage  30  when the liquid is poured from one inlet  35  may be anywhere as long as the one inlet  35  and the mounting portion  118  do not overlap in the vertical direction. The pouring position RP may be positioned closer to the opposite home position side than the positions illustrated in the figures, or may be positioned closer to the home position HP side than the positions illustrated in the figures. When a plurality of liquid containers  34  are loaded on the carriage  30  and liquid is poured from one inlet  35 , the carriage  30  may move to the pouring position where the one inlet  35  and the mounting portion  118  do not overlap in the vertical direction. At the pouring position RP, if the one inlet  35  for pouring the liquid and the mounting portion  118  do not overlap in the vertical direction, at least one of the other inlets  35  into which the liquid is not poured may overlap the mounting portion  118  in the vertical direction.   As illustrated in  FIGS. 5, 14, 16, and 18 , the pouring position RP of the carriage  30  when the liquid is poured from the inlet  35  may be anywhere as long as the carriage  30  and the substrate coupling portion  143  do not overlap in the vertical direction. The pouring position RP may be positioned closer to the opposite home position side than the positions illustrated in the figures, or may be positioned closer to the home position HP side than the positions illustrated in the figures.   As illustrated in  FIGS. 5, 14, 16, and 18 , the pouring position RP of the carriage  30  when the liquid is poured from the inlet  35  may be anywhere as long as the carriage  30  and the mounting portion  118  do not overlap in the vertical direction. The pouring position RP may be positioned closer to the opposite home position side than the positions illustrated in the figures, or may be positioned closer to the home position HP side than the positions illustrated in the figures.   When an abnormal load occurs on a sliding portion due to foreign matter adhering to the guide plate  125  or the like, or when an unexpected power interruption such as a power failure occurs, the carriage  30  may stop at a place other than the home position HP or the pouring position RP. At this time, when the user opens the scanner unit  14 , the user can open the lid member  36  even though the carriage  30  is stopped at a place other than the pouring position RP. For that reason, when the carriage  30  is stopped at the place other than the pouring position RP, a plurality of opening/closing inhibiting portions  24  may be provided at positions where the user cannot open the lid member  36 .   The opening/closing inhibiting portion  24  may be disposed so that the user can open only one lid member  36  by providing an opening that is larger than the length of one lid member  36  in the scanning direction and smaller than the length of two lid members  36  in the scanning direction. For example, a liquid residual amount sensor detects a color of ink to be poured and the carriage  30  is moved to a position where the ink lid member  36  is opened. At this time, the length of the notch  25  in the scanning direction may be shortened so that the user may visually recognize only the remaining amount checking section  37   a  for the ink. At this time, since the user pours the ink into the inlet  35  in which the remaining amount checking section  37   a  can be visually recognized, there is little possibility that the color of the ink to be poured is wrong.   The length of the opening/closing inhibiting portion  24  in the scanning direction may be short. For example, the length of the opening/closing inhibiting portion  24  may be short when the number of the inlets  35  is small, when the length of the carriage  30  in the width direction is short, when the length of the mounting portion  118  in the width direction is short, when the length of the waste liquid container  150  in the width direction is short, and the like. In the case where the number of the inlets  35  is one, when the inlet  35  overlaps the mounting portion  118  in the vertical direction, the opening/closing inhibiting portion  24  only needs to have a length capable of inhibiting opening and closing of the lid member  36  corresponding to the inlet  35 . When there are a plurality of inlets  35 , when the carriage  30  moves to the pouring position RP, the opening/closing inhibiting portion  24  only needs to have a length capable of inhibiting opening and closing of the lid member  36  corresponding to the inlet  35  which is at a position that overlaps the mounting portion  118  in the vertical direction.   A window through which the user visually recognizes the remaining amount checking section  37   a  may be provided on the panel unit  23  or the front surface  12   a  of the casing  12  so that the user can visually recognize the remaining amount checking section  37   a  without opening the scanner unit  14 . A window through which the user visually recognizes the remaining amount checking section  37   a  may be provided on the panel unit  23  or the front surface  12   a  of the casing  12  so that the user can visually recognize the remaining amount checking section  37   a  without moving the carriage  30  to the pouring position RP.   In the remaining amount checking section  37   a , a light for irradiating light from the depth side of the apparatus may be provided in the liquid container  34  so that the liquid level is easily seen when the user checks the remaining amount of the liquid, a window through which light enters the liquid container  34  may be provided on the side surface of the carriage  30  or the side surface of the casing  12 , or a place where a user can illuminate so that the inside of the liquid container  34  can be seen may be provided.   The lid member  36  that can open and close the inlet  35  may be coupled to the carriage  30  or the liquid container  34 . The lid member  36  has a function of opening and closing, and may be provided as a single unit. The method of opening and closing is not limited, and a lever method as in the embodiments or a rubber stopper may be used. The opening and closing method may be any as long as it can be opened and closed by the user.   In the third embodiment, the maintenance mechanism  130  may be outside the home position HP side of the transport path  40 , or may be outside the opposite home position side of the transport path  40 . When the maintenance mechanism  130  is outside the home position HP side of the transport path  40 , the discharge tube  135  passes through the depth side of the liquid ejection apparatus  11  and crosses the transport path  40  in the scanning direction.   In the fourth embodiment, the maintenance mechanism  130  may be outside the home position HP side of the transport path  40  in the scanning direction, or may be outside the opposite home position side of the transport path  40  in the scanning direction. When the maintenance mechanism  130  is outside the opposite home position side of the transport path  40  in the scanning direction, the discharge tube  135  passes through the depth side of the liquid ejection apparatus  11  and crosses the transport path  40  in the scanning direction.   When the liquid ejection head  20  is positioned outside the transport path  40  in the scanning direction, if the liquid ejection head  20  is at a position that overlaps the carriage  30  in the vertical direction, the mounting portion  118  may be disposed above the carriage  30  in the vertical direction. As long as a configuration in which the accommodation space can be secured at a position above the carriage  30  in the casing  12  is adopted, the mounting portion  118  can be disposed above the carriage  30  when the mounting portion  118  is at the home position HP. In this case, the mounting portion  118  may have a configuration in which the waste liquid container  150  is detachably mounted from the front of the liquid ejection apparatus  11 , or may have a configuration in which the waste liquid container  150  is detachably inserted in a height direction from a position downstream in the transport direction on the upper surface of the liquid ejection apparatus  11 .   In each embodiment described above, the configuration in which the width dimension of the carriage  30  is larger than the width dimension of the mounting portion  118 , the entire area in the width direction of the mounting portion  118  overlaps the carriage  30  in the vertical direction, and a part in the width direction of the carriage  30  overlaps the mounting portion  118  in the vertical direction, but is not limited thereto. A configuration in which the width dimension of the mounting portion  118  is made larger than the width dimension of the carriage  30 , a part of the mounting portion  118  overlaps the carriage  30  in the vertical direction, and the entire area in the width direction of the carriage  30  overlaps the mounting portion  118  in the vertical direction.       

     Furthermore, the mounting portion  118  and the carriage  30  may be configured to have the same width, the mounting portion  118  and the carriage  30  may be configured to overlap each other in the vertical direction in the entire region, or may be configured to partially overlap each other.
         It is sufficient that the mounting portion  118  and the carriage  30  partially overlap in the vertical direction. For example, the outer end of the mounting portion  118  may be positioned outside the outer end of the carriage  30  when positioned at the home position HP in the scanning direction.   One mounting portion  118  may be provided on each of both sides of the transport path  40  in the scanning direction. In this case, the two mounting portions  118  may overlap the carriage  30  in the vertical direction when positioned at the home position HP or the carriage  30  when positioned at the opposite home position, respectively. A configuration in which only one of the two mounting portions  118  overlaps the carriage  30  in the vertical direction when positioned at the home position HP or the opposite home position may be adopted. The attachment and detachment of the waste liquid containing bodies  150  with respect to the two mounting portions  118  may be performed from the front surface of the casing  12  or from the side surface of the casing  12 . The attachment and detachment with respect to one mounting portion  118  may be performed from the front surface of the casing  12  and the attachment and detachment with respect to the other mounting portion  118  may be performed from the side surface of the casing  12 . Furthermore, the sizes of the waste liquid containing bodies  150  detachably mounted to the two mounting portions  118  may be the same or different.   When the liquid is poured from the inlet  35 , if the inlet  35  and the mounting portion  118  do not overlap in the vertical direction, the carriage  30  may partially overlap the mounting portion  118  in the vertical direction.   The mounting portion  118  and the maintenance mechanism  130  may be disposed so as to overlap in the scanning direction. For example, the mounting portion  118  and the maintenance mechanism  130  may be disposed side by side in the width direction.   The mounting portion  118  may be disposed at a position upstream of the maintenance mechanism  130  in the transport direction.   When the liquid ejection head  20  is outside the transport path  40  in the scanning direction, if the carriage  30  is disposed at a position that overlaps the mounting portion  118  in the vertical direction, a part of the mounting portion  118  may be disposed below the transport path  40 . For example, if the configuration does not include the medium tray  21 , a part of the waste liquid container  150  can be disposed below the medium support member  33 .   The liquid ejection apparatus  11  may be a liquid ejection apparatus that ejects liquid other than ink. The state of the liquid ejected as a minute amount of liquid droplets from the liquid ejection apparatus includes a state that leaves a tail in a granular shape, a tear shape, or a thread shape. The liquid here may be any material that can be ejected from the liquid ejection apparatus. For example, it is sufficient that the liquid is in a state when a substance is in a liquid phase, and includes fluids such as liquid material having high or low viscosity, sol, gel water, other inorganic solvents, organic solvents, solutions, liquid resins, liquid metals, and metal melts. The liquid includes not only liquid as one state of a substance but also liquid in which particles of a functional material formed of a solid such as a pigment or metal particles are dissolved, dispersed, or mixed in a solvent. Representative examples of the liquid include ink and liquid crystal as described in the embodiments described above. Here, the ink includes general water-based ink and oil-based ink, and various liquid compositions such as gel ink and hot melt ink. As a specific example of the liquid ejection apparatus, for example, there is an apparatus for ejecting liquid containing a material such as an electrode material and a coloring material used for manufacturing a liquid crystal display, an electroluminescence display, a surface-emitting display, a color filter, and the like in a dispersed or dissolved form. The liquid ejection apparatus may be an apparatus for ejecting a biological organic substance used for manufacturing a biochip, an apparatus that is used as a precision pipette and ejects liquid serving as a sample, a printing apparatus, a micro-dispenser, and the like. The liquid ejection apparatus may be an apparatus for ejecting lubricating oil to precision machines such as watches and cameras in a pinpoint manner or an apparatus for ejecting transparent resin liquid such as an ultraviolet curable resin onto a substrate to form a micro hemispherical lens, an optical lens, and the like used for an optical communication element. The liquid ejection apparatus may be an apparatus for ejecting etchant such as an acid or an alkali for etching a substrate or the like.       

     In the following, technical ideas and operational effects grasped from the embodiments and modification examples described above will be described. 
     A. A liquid ejection apparatus includes a liquid ejection head that ejects liquid to a medium transported in a transport direction on a transport path, a liquid container that includes a containing chamber for containing liquid to be supplied to the liquid ejection head and an inlet for pouring the liquid into the containing chamber, a carriage movable in a scanning direction that intersects the transport direction in a state where the liquid ejection head and the liquid container are loaded on the carriage, and a mounting portion on which a waste liquid container that contains liquid as waste liquid discharged from the liquid ejection head is detachably mounted, and the mounting portion is provided in a region on a front side in the transport direction of the liquid ejection apparatus, and when the liquid ejection head is located outside the transport path in the scanning direction, the carriage is disposed at a position that overlaps the mounting portion in the vertical direction. The expression “overlapping the mounting portion in the vertical direction” includes a case where the carriage overlaps the entire mounting portion and a case where the carriage overlaps only a part of the mounting portion. 
     According to this configuration, even in the configuration in which the waste liquid container is mounted, when the liquid ejection head is outside the transport path, the carriage overlaps the mounting portion in the vertical direction, and thus the mounting area of the liquid ejection apparatus does not increase as compared with a liquid ejection apparatus having a configuration in which the carriage and the mounting portion do not overlap. The waste liquid container is detachably mounted to the mounting portion downstream in the transport direction of the casing, and thus operability when attaching and detaching the waste liquid container is good. Therefore, the operability when attaching and detaching the waste liquid container is good, and the increase in the mounting area of the liquid ejection apparatus can be suppressed. 
     B. In the liquid ejection apparatus, the mounting portion may be configured to attach and detach the waste liquid container to and from a region on the front side in the transport direction of the liquid ejection apparatus. 
     According to this configuration, a space for mounting the medium discharged from the transport path is secured downstream in the transport direction of the casing, and a new work space for removing the waste liquid container is not required. Therefore, the mounting area of the liquid ejection apparatus does not need to be large, and an occupied space including a working space of the liquid ejection apparatus does not need to be large. 
     C. In the liquid ejection apparatus, the inlet may be provided in a region on the front side in the transport direction of the liquid ejection apparatus, and when the liquid ejection head is located outside the transport path in the scanning direction, the inlet may be disposed at a position that overlaps the mounting portion in the vertical direction. 
     According to this configuration, the user can perform both the operation of pouring liquid from the inlet and the operation of attaching and detaching the waste liquid container to and from the mounting portion from the front of the apparatus, thereby improving workability of the user. Both operations can be performed from the front of the apparatus, the degree of freedom in installing the apparatus is increased. 
     D. In the liquid ejection apparatus, when the liquid is poured from the inlet, the carriage may move to a pouring position where the inlet and the mounting portion do not overlap in the vertical direction. 
     According to this configuration, it is possible to suppress that liquid dripping at the time of pouring adheres to the waste liquid container. 
     E. In the liquid ejection apparatus, the carriage may be loaded with a plurality of the liquid containers, and when liquid is poured from one inlet, the carriage may move to a pouring position where the one inlet and the mounting portion do not overlap in the vertical direction. 
     According to this configuration, it is possible to suppress that liquid dripping at the time of pouring adheres to the waste liquid container. 
     F. In the liquid ejection apparatus, the mounting portion may include a substrate coupling portion electrically coupled to a circuit substrate provided in the waste liquid container, and the pouring position may be a position where the carriage does not overlap the substrate coupling portion in the vertical direction. 
     According to this configuration, it is possible to suppress that liquid dripping at the time of pouring adheres to the substrate coupling portion. 
     G. In the liquid ejection apparatus, the pouring position may be a position where the carriage does not overlap the mounting portion in the vertical direction. 
     According to this configuration, it is possible to suppress that liquid dripping at the time of pouring adheres to the mounting portion. It is possible to suppress that liquid dripping at the time of pouring adheres to the waste liquid container. 
     H. The liquid ejection apparatus may further include a lid member that opens and closes the inlet and an opening/closing inhibiting portion that inhibits opening and closing of the lid member when the inlet overlaps the mounting portion in the vertical direction. 
     According to this configuration, the user is prevented from pouring the liquid at a position where liquid dripping at the time of the pouring may adhere to the waste liquid container.