Abstract:
An inkjet printing apparatus, comprising: a recording head; an ink reservoir; an ink receiver; a first waste liquid reservoir comprising a first holding body; a second waste liquid reservoir comprising a second holding body; and a housing, wherein: the second waste liquid reservoir is movable between a first position where the first and second holding bodies contact and a second position; in a state where the second waste liquid reservoir is at the second position, the first holding body overlaps with the second holding body in an intersecting direction intersecting with a moving direction in which the second waste liquid reservoir moves; and in a state where the second waste liquid reservoir is disposed at the first position, the first and second holding bodies contact such that at least one of the first and second holding bodies elastically deforms to show an restoring force in the intersecting direction.

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
       [0001]    This application claims priority under 35 U.S.C. §119 from Japanese Patent Application No. 2016-073021, filed on Mar. 31, 2016. The entire subject matter of the application is incorporated herein by reference. 
       BACKGROUND 
     Technical Field 
       [0002]    Aspects of the present disclosure relate to an inkjet printing apparatus having a waste liquid reservoir for storing ink sucked from a recording head. 
       Related Art 
       [0003]    An inkjet printing apparatus which forms an image on a sheet by ejecting ink from nozzles of a recording head is known. Such an inkjet printing apparatus includes a sucking unit in which, in order to remove foreign substances from the nozzles of the recording head, the foreign substances in the nozzles of the recording head are sucked by a pump and are stored in a waste ink reservoir. 
         [0004]    In the inkjet printing apparatus, the waste ink reservoir is divided into a fixed waste ink reservoir which is fixedly disposed and a detachable waste ink reservoir which is detachably attachable to the fixed waste ink reservoir. In a state where the detachable waste ink tank is attached to the fixed waste ink reservoir, a fixed waste ink storing body of the fixed waste ink reservoir and a detachable waste ink storing body of the detachable waste ink reservoir contact with each other. 
       SUMMARY 
       [0005]    In the above described conventional inkjet printing apparatus, the fixed waste ink storing body and the detachable waste ink storing body contact with each other in a direction equal to a moving direction in which the detachable waste ink reservoir is detached. Therefore, there is a concern that, due to tolerance of components, the fixed waste ink storing body cannot contact the detachable waste ink body. Furthermore, there is a concern that, due to pressure caused by contact between the fixed waste ink storing body and the detachable waste ink storing body, the fixed waste ink reservoir and the detachable waste ink reservoir move to separate from each other. 
         [0006]    In consideration of the above, aspects of the present disclosure provide an inkjet printing apparatus configured such that, in a configuration where at least one of two waste liquid reservoirs is detachably attachable to the apparatus, ink holding bodies of the two waste liquid reservoirs securely contact with each other. 
         [0007]    According to an aspect of the present disclosure, there is provided an inkjet printing apparatus, comprising: a recording head configured to eject ink from nozzles; an ink reservoir configured to be connected to the recording head to supply ink to the recording head; an ink receiver configured to receive the ink discharged from the recording head; a first waste liquid reservoir configured to be connected to the ink receiver to let the ink move between the ink receiver and the first waste liquid reservoir, the first waste liquid reservoir comprising a first holding body configured to hold the ink; a second waste liquid reservoir comprising a second holding body configured to hold the ink; and a housing. In this configuration, the first waste liquid reservoir is fixed to the housing. The second waste liquid reservoir is configured to be movable between a first position where the first holding body and the second holding body contact with each other and a second position where the first holding body and the second holding body are separated from each other. In a state where the second waste liquid reservoir is disposed at the second position, the first holding body overlaps with the second holding body in an intersecting direction intersecting with a moving direction in which the second waste liquid reservoir moves from the first position to the second position. In a state where the second waste liquid reservoir is disposed at the first position, the first holding body and the second holding body contact with each other such that at least one of the first holding body and the second holding body elastically deforms to show an restoring force in the intersecting direction. 
         [0008]    According to another aspect of the present disclosure, there is provided an inkjet printing apparatus, comprising: a head; an ink reservoir being connected to the head; an ink receiver; a first waste liquid reservoir being connected to the ink receiver, the first waste liquid reservoir comprising a first holding body; a second waste liquid reservoir comprising a second holding body; and a housing. In this configuration, the first waste liquid reservoir is fixed to the housing. The second waste liquid reservoir is movable between a first position where the first holding body and the second holding body contact with each other and a second position where the first holding body and the second holding body are separated from each other. In a state where the second waste liquid reservoir is disposed at the second position, the first holding body overlaps with the second holding body in an intersecting direction intersecting with a moving direction in which the second waste liquid reservoir moves from the first position to the second position. In a state where the second waste liquid reservoir is disposed at the first position, the first holding body and the second holding body contact with each other such that at least one of the first holding body and the second holding body elastically deforms to show an restoring force in the intersecting direction. 
     
    
     
       BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS 
         [0009]      FIG. 1  is a perspective view illustrating an outer appearance of a multifunction apparatus according to an illustrative embodiment. 
           [0010]      FIG. 2  schematically illustrates an inner configuration of a printer unit in the multifunction apparatus. 
           [0011]      FIG. 3  schematically illustrates a maintenance unit in the multifunction apparatus. 
           [0012]      FIG. 4  is a perspective view illustrating the inner configuration of the printer unit in which a carriage is disposed at a maintenance position and a movable waste ink tank is disposed at a mounting position. 
           [0013]      FIG. 5  is a plan view illustrating the inner configuration of the printer unit in which the carriage is disposed at the maintenance position and the movable waste ink tank is disposed at the mounting position. 
           [0014]      FIG. 6  is a plan view illustrating the inner configuration of the printer unit in which the carriage is disposed at a central position in a left and right direction and the movable waste ink tank is disposed at a non-mounting position. 
           [0015]      FIG. 7  is a perspective view illustrating a state where a fixed waste ink tank and the movable waste ink tank are viewed from the upper left side, where the movable waste ink tank is disposed at the mounting position. 
           [0016]      FIG. 8  is a perspective view illustrating a state where the fixed waste ink tank and the movable waste ink tank are viewed from the upper right side, where the movable waste ink tank is disposed at the mounting position. 
           [0017]      FIG. 9  is a cross sectional view of an A-A cross section in  FIG. 8 . 
           [0018]      FIG. 10  is a cross sectional view of the fixed waste ink tank in a B-B cross section in  FIG. 8 . 
           [0019]      FIG. 11  is a cross sectional view of the movable waste ink tank in the B-B cross section in  FIG. 8 . 
           [0020]      FIG. 12  is a cross sectional view illustrating a status where the movable waste ink tank is disposed at the non-mounting position in the B-B cross section shown in  FIG. 8 . 
           [0021]      FIG. 13  is a cross sectional view illustrating a status where the movable waste ink tank is disposed at a contacting position in the B-B cross section shown in  FIG. 8 . 
           [0022]      FIG. 14  is a cross sectional view illustrating a status where the movable waste ink tank is disposed at the mounting position in the B-B cross section shown in  FIG. 8 . 
           [0023]      FIG. 15  is a cross sectional view illustrating a status where the movable waste ink tank is disposed at a wiping position in the B-B cross section shown in  FIG. 8 . 
           [0024]      FIG. 16  is a partial cross sectional view schematically illustrating the movable waste ink tank and a lower cover in a C-C cross section shown in  FIG. 5 . 
           [0025]      FIG. 17  is a partial cross sectional view schematically illustrating the movable waste ink tank and guide parts in a D-D cross section shown in  FIG. 5 . 
           [0026]      FIG. 18  is a partial cross sectional view schematically illustrating an ink holding body of the fixed waste ink tank and an ink holding body of the movable waste ink tank in an E-E cross section shown in  FIG. 14 . 
       
    
    
     DETAILED DESCRIPTION 
       [0027]    Hereinafter, an illustrative embodiment is described with reference to the accompanying drawings. In the following explanation, an up and down direction  7  is defined with respect to a state where a multifunction apparatus  10  is installed to be usable (i.e., a state shown in  FIG. 1 ), a front and rear direction  8  is defined with respect to a state where a surface on which an opening  22  is formed is defined as a front surface, and a left and right direction  9  is defined in a state where the multifunction apparatus  10  is viewed from the front side. 
         [0028]    (Overall Configuration of Multifunction Apparatus  10 ) 
         [0029]    The multifunction apparatus  10  has the printing function and the scanner function. As shown in  FIG. 1 , the multifunction apparatus  10  has a rectangular parallelepiped shape constituted by a printer housing  11  and a scanner housing  12  stacked on the upper side of the printer housing  11 . On the front surface of the multifunction apparatus  10 , am operation panel  13  including various operation buttons and a liquid crystal display is provided. 
         [0030]    The printer housing  11  forms an outer wall of a printer unit  14  for recording an image on a recording medium  19 . As shown in  FIG. 2 , the printer unit  14  records an image on the recording medium  19  conveyed from a supply tray  20 , and discharges the recording medium  19  on which an image has been recorded to a discharge tray  21 . Each of the supply tray  20  and the discharge tray  21  is detachably attachable to the printer housing  11  via the opening  22  formed on the front surface of the printer housing  11 . The scanner housing  12  forms an outer wall of an image scanner unit having a flat bed scanner. Details about the image scanner unit will be described later. 
         [0031]    (Printer Unit  14 ) 
         [0032]    As shown in  FIG. 2 , a supply roller  25  is disposed on an upper side of the supply tray  20 . A supply arm  26  rotatably supports the supply roller  25 . Depending on the thickness of a plurality of recording media  19  supported on the support tray  20 , the supply roller  25  moves in the up and down direction  7  and the supply arm  26  rotates depending on movement of the supply roller  25 . To the supply roller  25 , rotation of a motor (not shown) is transmitted via a series of gears. By letting the supply roller  25  rotate while contacting the recording medium  19  on the supply tray  20 , a recording medium at the top of the stacked recording media  19  is supplied to a conveying path  23 . 
         [0033]    The conveying path  23  is formed to turn from a rear edge of the supply tray  20  toward the front side of the printer unit  14 , and to extend straight toward the discharge tray  21  in the front and rear direction  8 . The conveying path  23  is disposed at a central portion in the left and right direction  9  in the inside of the printer housing  11  (see  FIG. 1 ). On the conveying path  23 , a pair of conveying rollers  54  and a pair of discharge rollers  55  are provided. On the conveying path  23 , the conveying rollers  54  and the discharge rollers  55  pinch the recording medium  19  to convey the recording medium  19  in a conveying direction  15 . By being conveyed by at least one of the pair of conveying rollers  54  and the pair of discharge rollers  55 , the recording medium  19  supplied from the supply tray  20  is U-turned from the lower side to the upper side along the conveying path  23  to reach a position under the recording unit  24 , and is subjected to image forming by the recording unit  24 . Then, the recording medium  19  is discharged to the discharge tray  21 . 
         [0034]    The recording unit  24  performs the image forming in an inkjet recording manner. The recording unit  24  includes a recording head  65  and a carriage  67 . The carriage  67  is disposed on the upper side of the conveying path  23 . By letting a driving force from a motor (not shown) be transmitted to the carriage  67  via a belt drive mechanism (not shown), the carriage  67  moves along guide rails  43  and  44  (see  FIGS. 4 to 6 ) extending in the left and right direction  9 . The recording head  65  is mounted on the carriage  67 . On the lower side of the recording head  65 , a platen  66  is disposed. The platen  66  is provided to expand in a region (i.e., the entire region of the conveying path  23  in the left and right direction  9 ) in which the carriage  67  moves, and supports, from the lower side, the recording medium  19  being conveyed along the conveying path  23 . The recording head  23  faces the platen  66 . By letting the recording head  65  selectively eject ink to the recording medium  19  supported on the platen  66  while the carriage  67  moves in the left and right direction  9 , an image is recorded on the recording medium  19 . 
         [0035]    As shown in  FIG. 3 , on the lower surface of the recording head  65 , a plurality of nozzles  69  are formed. The nozzles  69  are arranged in a plurality of rows along the conveying direction  15  (see  FIG. 2 ). For example, four rows nozzles  69  for cyan, magenta, yellow and black ink may be formed. 
         [0036]    As shown in  FIGS. 4 to 6 , the printer housing  11  has a lower cover  30  principally forming a lower surface and a part of the front surface of the multifunction apparatus  10 . By attaching an upper cover  29  (see  FIG. 13 ) principally forming lateral surfaces and a rear surface of the multifunction apparatus  10  to the upper side of the lower cover  30 , the printer housing  11  is formed. 
         [0037]    The lower cover  30  includes a lower wall  31  forming the lower surface of the printer housing  11 , a right wall  32  and a left wall  33  defining a space  34  in which the supply tray  20  is housed. The right wall  32  and the left wall  33  are formed to project upward from the lower wall  31 , and extend in parallel with each other in the front and rear direction  8 . By the right wall  32  and the left wall  33 , the space  34  is defined in the central portion of the lower wall  31  in the left and right direction  9 . In the lower cover  30 , a space  35  is formed on the upper side of the lower wall  31  and on the right side of the right wall  32 . In the space  35 , a maintenance mechanism  70  (see  FIG. 6 ), an ink refilling case  61 , a fixed waste ink tank  80  and a movable waste ink tank  110  are accommodated. 
         [0038]    (Ink Refilling Case  61 ) 
         [0039]    As shown in  FIGS. 4 to 6 , the printer unit  14  includes the ink refilling case  61 . The ink refilling case  61  is disposed in a front portion in the space  35 . The ink refilling case  61  is formed in a box shape having an opening on the front side. To the ink refilling case  61 , a plurality of ink cartridges  62  (see  FIG. 2 ) for storing ink of respective colors to be supplied to the recording head  65  are attached. A plurality of tubes  63  corresponding to the respective colors are formed to extend from the ink refilling case  61  to which the respective ink cartridges  62  are attached, to the recording head  65 . Thus, ink is supplied from the ink filling cartridge  62  to the recording head  65  via the tubes. On the front side of the multifunction apparatus  10 , the ink cartridges  62  are inserted to or removed from the ink refilling case  61  via an opening  48  of the lower cover  30 . 
         [0040]    The ink refilling case  61  and the ink cartridges  62  are disposed on the front side with respect to the carriage  67  in the space  35  of the lower cover  30 . In other words, the ink refilling case  61  and the ink cartridges  62  are disposed at positions not overlapping with the carriage  67  in the front and rear direction  8  (i.e., at different positions in the front and rear direction  8 ). Furthermore, right edges of the ink refilling case  61  and the ink cartridges  62  are disposed on the right side with respect to the right end of the moving range of the carriage  67  in the left and right direction  9 , i.e., on the right side with respect to the right edges of the guide rails  43  and  44 . That is, at least a part of the ink refilling case  61  and the ink cartridges  62  is disposed on the outside with respect to the moving range of the carriage  67  in the left and right direction  9 . 
         [0041]    (Maintenance Mechanism  70 ) 
         [0042]    As shown in  FIG. 6 , the maintenance mechanism  70  is disposed on the lower side with respect to a moving path of the recording head  65  and a right side with respect to the right edge of the platen  66  in the space  35 . In a state where the carriage  67  is positioned at the right end of the moving range in the left and right direction  9 , the maintenance mechanism  70  is disposed on the lower side with respect to the carriage  67 . As shown in  FIG. 3 , the maintenance mechanism  70  sucks ink from the nozzle  69  of the recording head  65 , and causes the sucked ink to flow into the fixed waste ink tank  80 . In the following, the ink discharged from the nozzles  69  by the maintenance mechanism  70  is referred to as “waste ink”. In  FIG. 3 , the fixed waste ink tank  80  is schematically illustrated to represent that the maintenance mechanism  70  and the fixed waste ink tank  80  are connected via tubes  76  and  77 ; however, this illustration does not intend to represent the positional relationship between the fixed waste ink tank  80  and other components. 
         [0043]    As shown in  FIG. 3 , the maintenance mechanism  70  includes a movable part  71 , a cam mechanism  72  for moving the movable part  71  in the up and down direction  7 , the tubes  76  and  77  and a pump  73 . The movable part  71  includes caps  74  and  75  made of rubber material. When the caps  74  and  75  are disposed at a maintenance position at which the carriage  67  is disposed on the upper side with respect to the movable part  71 , the caps  74  and  75  faces the lower surface of the recording head  65  in the up and down direction  7 . The cam mechanism  72  operates by receiving a driving force transmitted from a motor (not shown) to move the movable part  71  in the up and down direction  7 . When the movable part  71  moves to the upper side, the cap  74  and  75  contact a lower surface of the recording head  65 . At this time, the cap  74  covers the row of nozzle  69  ejecting black ink, and the cap  75  covers the rows of nozzles  69  ejecting cyan, magenta and yellow ink. To the caps  74  and  75 , ends of the tubes  76  and  77  are connected. Each of the tubes  76  and  77  is an elastic resin tube. 
         [0044]    The pump  73  is, for example, a rotary tube pump which operates by receiving a driving force from a motor (not shown). The pump  73  communicates with a sealed space between the lower surface of the recording head  65  and the caps  74  and  75 . When the pump  73  is driven in a state where the caps  74  and  75  cover the nozzles  69 , a negative pressure is caused in the caps  74  and  75  and thereby the ink discharged from the nozzles  69  is received by the caps  74  and  75 . The discharged ink received by the caps  74  and  75  is caused to flow into the fixed waste ink tank  80  via the tubes  76  and  77  by operation of the pump  73 . The inner space of the tube  76  is a flowing path for letting air flow, and an inner space of the tube  77  is a flowing path for letting the waste ink flow. 
         [0045]    (Wiper  45 ) 
         [0046]    As shown in  FIG. 6 , the maintenance mechanism  70  includes a wiper  45 . The wiper  45  is disposed at the same position as that of the nozzles  69  (see  FIG. 3 ) of the recording head  65  in the front and rear direction  8 , and is disposed at a position on the left side with respect to the caps  74  and  75  within the moving range of the nozzles  69  in the left and right direction  9 . The wiper  45  is formed to extend in the up and down direction  7  and to have a long shape in the front and rear direction  8 . The wiper  45  is made of, for example, rubber. 
         [0047]    The wiper  45  is movable in the up and down direction  8 . When the carriage  67  is disposed at the maintenance position shown in  FIGS. 4 and 5 , the upper edge of the wiper  45  is disposed at a position overlapping with the nozzles  69  in the up and down direction  7 . By movement of the carriage  67  to the left side, the upper edge of the wiper  45  wipes the nozzles  69 . In a process where the carriage  67  moves leftward from the maintenance position, the wiper  45  wipes the nozzles  69  in a state where the upper edge part of the wiper  45  bends leftward with respect to a proximal part of the wiper  45 . Therefore, after the carriage  67  has passed to the upper side of the wiper  45 , the upper edge part of the wiper  45  moves rightward by restoring motion of the upper edge part. As a result, the ink adhered to the wiper  45  is scattered rightward. The ink scattered rightward is received by an ink holding body  113  via an opening  119  of the movable waste ink tank  110  which is described later. 
         [0048]    (Fixed Waste Ink Tank  80 ) 
         [0049]    As shown in  FIGS. 4 to 6 , the fixed waste ink tank  80  is disposed in a central portion of the space  35  of the lower cover  30  in the front and rear direction  8 . The fixed waste ink tank  80  is disposed on the front side with respect to the carriage  67  and on the rear side with respect to the ink refilling case  61  and the ink cartridges  62 . Furthermore, the left edge of the fixed waste ink tank  80  is disposed at a position overlapping with the moving range of the carriage  67  in the left and right direction, i.e., a position on the left side with respect to the right edge of the guide rails  43  and  44 . The right edge of the fixed waste ink tank  80  is disposed on the right side with respect to the right end of the moving range of the carriage  67  in the left and right direction  9 , i.e., on the right side with respect to the right edges of the guide rails  43  and  44 . On the rear side of the fixed waste ink tank  80 , the maintenance mechanism  70  is disposed. The tubes  76  and  77  of the maintenance mechanism  70  are extended frontward to be connected to the fixed waste ink tank  80 . 
         [0050]    The fixed waste ink tank  80  is fixed to the lower cover  30 . As shown in  FIG. 12 , the fixed waste ink tank  80  is fixed to the lower cover  30 , for example, by screws  57 . Specifically, the lower cover  30  has a plurality of through holes  58  penetrating therethrough in the up and down direction  7  at positions in a region within which the fixed waste ink tank  80  is disposed. Further, the fixed waste ink tank  80  has screw holes  59  at positions respectively corresponding to the through holes of a lower wall  85 A. Each of the screw holes  59  is formed with internal thread and is formed to be recessed upward from the lower surface of the lower wall  85 A. The screws  57  are screwed into the screw holes  59  via the through holes  58  from the lower side of the lower wall  31  of the lower cover  30 , and thereby the fixed waste ink tank  80  is fixed to the lower cover  30 . The fixed waste ink tank  80  may be fixed to the lower cover  30  by another fixing manner other than screwing. For example, the lower wall  31  of the lower cover  30  and the fixed waste ink tank  80  may be provided with engagement parts, and the fixed waste ink tank  80  may be fixed to the lower cover  30  by letting the engagement parts of the lower cover  30  and the fixed waste ink tank  80  engage with respect to each other. Alternatively, the lower cover  30  and the fixed waste ink tank  80  may be integrally formed. 
         [0051]    As shown in  FIGS. 7 and 8 , the fixed waste ink tank  80  includes a fixed waste ink tank case  81  and an ink holding body  83 . 
         [0052]    As shown in  FIGS. 7 to 10 , the fixed waste ink tank case  81  is formed in a hollow box shape, and as an opening at an upper position. The opening  86  is formed in a shape of a letter of L when viewed as a plan view, and is defined by the upper edge of the fixed waste ink tank case  81 . 
         [0053]    The fixed waste ink tank case  81  includes a left part  87  formed in a rectangular parallelepiped shape expending in the left and right direction and being thinned in the front and rear direction  8 , and a right part  88  formed in a rectangular parallelepiped extending successively from the right edge of the left part  87  in the front and rear direction  8  and being thinned in the left and right direction  9 . The inner space of the left part  87  extends in the up and down direction  7 , and communicates with the inner space of the right part  88  at the right edge of the upper portion of the left part  87 . The inner space of the right part  88  extends in the front and rear direction  8 , and communicates with the inner space of the left part  87  at the left edge of the front part of the right part  88 . The lower edge of the inner space of the left part  87  is disposed on a lower side with respect to the lower edge of the inner space of the right part  88 . The rear edge of the inner space of the right part  88  is disposed on the rear side with respect to the rear edge of the inner space of the left part  87 . Specifically, the inner space of the left part  87  is partitioned by a left half part of the front wall  91 , the left wall  92 , the rear wall  93 , a frontward middle wall  94  and the lower wall  85 A. 
         [0054]    As shown in  FIGS. 7 and 8 , a left half part of the front wall  91  of the fixed waste ink tank case  81  forms the front edge of the left part  87 . The left half part of the front wall  91  has a rectangular plate-like shape expanding in the up and down direction  7  and the left and right direction  9 . 
         [0055]    As shown in  FIGS. 7 and 9 , the left wall  92  of the fixed waste ink tank case  81  forms the left edge of the left part  97 . The left wall  92  has a rectangular plate-like shape expanding in the up and down direction  8  and the left and right direction  9 . 
         [0056]    As shown in  FIGS. 9 and 10 , the frontward middle wall  94  of the fixed waste ink tank case  81  forms the right edge of the left part  87 . The frontward middle wall  94  has a rectangular plate-like shape expanding in the up and down direction  7  and the front and rear direction  8 . The upper edge of the frontward milled wall  94  is disposed on a lower side with respect to the upper edge of the left half part of the front wall  91  and the upper edge of the rear wall  93 . As a result, the inner space of the left part  87  and the inner space of the right part  88  communicate with each other in an upper portion of the right edge of the left part  87 . 
         [0057]    The lower wall  85 A forming the lower edge of the left part  87  is a part of the lower wall  85 , and has a rectangular plate-like shape expending in the front and rear direction  8  and the left and right direction  9 . 
         [0058]    As shown in  FIGS. 9 and 10 , the inner space of the right part  88  is partitioned by a rearward middle wall  95 , the right half of the front wall  91 , the rear wall  97  and the lower wall  85 B. 
         [0059]    The rearward middle wall  95  of the fixed waste ink tank case  81  forms the left edge of the right part  88 . The rearward middle wall  95  has a rectangular plate-like shape expanding in the up and down direction  7  and the front and rear direction  8 . 
         [0060]    The rear wall  97  of the fixed waste ink tank case  81  forms the rear edge of the right part  88 . The rear wall  97  has a rectangular plate-like shape expanding in the up and down direction  7  and the left and right direction  9 . 
         [0061]    As shown in  FIGS. 7 and 8 , the right half part of the front wall  91  of the fixed waste ink tank case  81  forms the front edge of the right part  88 . A central portion of the front wall  91  in the left and right direction  9  and the front edge of the rearward middle wall  95  are spaced in the front and rear direction  8 . With this configuration, the inner space of the right part  88  and the inner space of the left part  87  communicate with each other. 
         [0062]    As shown in  FIG. 8 , the right wall  98  of the fixed waste ink tank case  81  forms the right edge of the right part  88 . The right wall  98  has a rectangular plate-like shape expanding in the up and down direction  7  and the front and rear direction  8 . 
         [0063]    As shown in  FIGS. 9 and 10 , the lower wall  85 B forming the lower edge of the right part  88  is a part of the lower wall  85 , and has a rectangular plate-like shape expanding in the front and rear direction  8  and the left and right direction  9 . In the up and down direction  7 , the lower wall  85 B is disposed at the same position as that of the upper edge of the frontward middle wall  94 . 
         [0064]    On the rear side with respect to the lower wall  85 B, an opening  100  partitioned by the lower edge of the lower wall  85 B, the front surface of the rear wall  97 , the right surface of the rearward middle wall  95   m  and the left surface of the right wall  98  is formed. 
         [0065]    As shown in  FIGS. 7 to 10 , in the inner space of the fixed waste ink tank case  81 , the ink holding body  83  is provided. The ink holding body  83  is made of, for example, fiber materials such as a felt molded article. The waste ink flowed into the inner space of the fixed waste ink tank case  81  is absorbed and held by the ink holding body  83  made of fiber materials. 
         [0066]    The ink holding body  83  is formed of a plurality of parts (five parts in this illustrative embodiment) each of which has a rectangular parallelepiped shape, and is disposed to be filled in the inner space of the fixed waste ink tank case  81 . 
         [0067]    As shown in  FIG. 10 , the ink holding body  83  has a projecting part  107  projecting downward from the lower surface of the ink holding body  83  at a rear edge part of a portion of the ink holding body  83  positioned in the inner space of the right part  88 . The projecting part  107  has a flat rectangular parallelepiped shape extending in the left and right direction  9 . The projecting part  107  serving as a free end is formed to project to the outside of the fixed waste ink tank case  81  through the opening  100  of the fixed waste ink tank case  81 . That is, a lower edge  107 B of the projecting part  107  extends to a lower position with respect to the rear wall  85 B of the fixed waste ink tank case  81 , and is exposed to the outside of the fixed waste ink tank case  81 . A proximal end  107 E of the projecting part  107  is disposed at the opening  100  of the fixed waste ink tank case  81 . 
         [0068]    As shown in  FIGS. 7 and 9 , the fixed waste ink tank case  81  is provided with ports  101  and  102  to which the tubes  76  and  77  are connected, respectively. The ports  101  and  102  are disposed to be spaced from each other in the up and down direction  7 . The port  102  disposed on the lower side with respect to the port  103  has a shape of a circular tube projecting to the left side from the left wall  92 . The inner space of the port  102  penetrates through the left wall  92 . The inner space of the port  102  lets the outside and the inner space of the fixed waste ink tank case  81  communicate with each other. To the port  102 , the tube  77  is connected. 
         [0069]    When the waste ink flows into the inner space of the fixed waste ink tank  80  through the tube  77  and the port  102 , the waste ink moves to the lower portion in the left part  87  while being held and absorbed by the ink holding body  83 , and then the lower portion in the left part  87  with respect to the port  102  is filled with the waste ink. Thereafter, the waste ink reaches the upper portion in the left part  87  with respect to the port  102  while passing through the ink holding body  83 . Then, the waste ink moves to the rear portion in the inner space of the right part  88  while passing through the ink holding body  83 , reaches the projecting part  107  of the ink holding body  83 , and then moves downward. 
         [0070]    As shown in  FIG. 7 , on the left surface of the left wall  92 , a recessed part  105  is formed to be recessed downward. Specifically, as shown in  FIG. 9 , the left wall  92  branches, at a central portion  92 A in the up and down direction  7 , to an outer wall  92 B extending straight and upward from the central portion  92 A and an inner wall  92 C extending upward after being bent rightward. The recessed part  105  is partitioned by the outer wall  92 B, the inner wall  92 C, the front wall  91  and the rear wall  93 . 
         [0071]    The upper port  101  is formed in a circular tube projecting rightward from the outer wall  92 B of the left wall  92 , and the inner space of the port  101  penetrates through the outer wall  92 B. The inner space of the port  101  lets the inner space of the recessed part  105  and the outside communicate with each other. To the port  101 , the tube  76  is connected. 
         [0072]    (Movable Waste Ink Tank  110 ) 
         [0073]    As shown in  FIGS. 4 and 5 , in a state where the movable waste ink tank  110  is disposed at the mounting position, the movable waste ink tank  110  is disposed on the rear side with respect to the central part of the inner space  35  of the lower cover  30  in the front and rear direction  8 . The movable waste ink tank  110  is disposed on the rear side with respect to the ink refilling case  61 , the ink cartridge  62  and the fixed waste ink tank  80 . Furthermore, the movable waste ink tank  110  is disposed on the right side with respect to the right edge of the moving range of the carriage  67  in the left and right direction  9 , i.e., the movable waste ink tank  110  is disposed, on the right side with respect to the right edge of the guide rails  43  and  44 , at a position overlapping with the ink refilling case  61  and the ink cartridge  62  in the left and right direction  9 . In other words, the movable waste ink tank  110  is disposed in a region overlapping, in the left and right direction  9 , with a region in which the ink refilling case  61  and the ink cartridge  62  are provided and in a region overlapping, in the front and rear direction  8 , with a region in which the carriage  67  is provided. Furthermore, the movable waste ink tank  110  is disposed at a position overlapping with the supply tray  20  in the up and down direction  7 . 
         [0074]    As shown in  FIGS. 7 and 8 , the movable waste ink tank  110  includes a movable waste ink tank case  111  and an ink holding body  113 . 
         [0075]    The movable ink tank case  111  has a hollow box shape, and has an opening  117  on the upper side. The outer shape of the movable ink tank case  111  is a rectangular parallelepiped shape which is thin in the left and right direction  9  and is extended in the front and rear direction  8 . The opening  117  is partitioned by the upper edge of the movable waste ink tank case  111 . The movable waste ink tank case  111  includes an front wall  141 , a rear wall  142 , a left wall  143 , a right wall  144  and a lower wall  116  (see  FIG. 11 ), and the inner space partitioned by these walls is filled with the ink holding body  113 . The upper edge of the rear wall  142 , the upper edge of the left wall  143  being at the same position as the upper edge of the rear wall  142  in the up and down direction  7 , and the upper edge of the right wall  144  constitute the upper edge  115  of the movable waste ink tank  110 . The upper edge  115  is disposed on the upper side with respect to the upper edge of the supply tray  20 . 
         [0076]    As shown in  FIG. 11 , the lower portion of the front edge of the movable waste ink tank case  111  is projected frontward with respect to the upper portion of the front edge. In the state where the movable ink tank  110  is disposed at the mounting position, the lower portion of the front edge of the movable waste ink tank case  111  is disposed on the lower side with respect to the lower wall  85 B of the right part  88  of the fixed waste ink tank case  81 . 
         [0077]    The right wall  144  has a rectangular plate-like shape expanding in the up and down direction  7  and the front and rear direction  8 . Although not shown in the drawings, the lower portion of the front edge of the right wall  144  is projected frontward with respect to an upper portion  144 B (see  FIG. 8 ) of the front edge of the right wall  144 . 
         [0078]    As shown in  FIG. 11 , the left wall  143  has a rectangular plate-like shape expanding in the up and down direction  7  and the front and rear direction  8 . A lower portion  143 A of the front edge of the left wall  143  is projected frontward with respect to an upper portion  143 B of the front edge of the left wall  143 . 
         [0079]    As shown in  FIG. 7 , the left wall  143  has a recessed part  145  formed such that the upper edge of the left wall  143  is recessed downward in the central portion in the front and rear direction  8 . By the recessed par  145 , an opening  119  penetrating through the left wall  143  in the left and right direction  9  is formed. With this configuration, when the ink adhered to the wiper  45  is scattered by letting the wiper  45  wipe the nozzles  69  of the recording head  65 , scattered ink drops are adhered to the ink holding body  113 . Then, the ink drops are held by the ink holding body  113 . 
         [0080]    The left wall  143  and the right wall  144  have the same shape excepting the recessed part  145 , and are disposed at the same position in the up and down direction  7  and the front and rear direction  8 . 
         [0081]    As shown in  FIG. 11 , the front wall  141  has a rectangular plate-like shape expanding in the up and down direction  7  and the left and right direction  9 . The front wall  141  is provided to extend between the lower portion  143 A of the front edge of the left wall  143  and the lower portion (not shown) of the front edge of the right wall  144 . The upper edge of the front wall  141  is disposed on the lower side with respect to the upper edge of the lower portion  143 A of the front edge of the left wall  143 . 
         [0082]    The rear wall  142  has a rectangular plate-like shape expanding in the up and down direction  7  and the left and right direction  9 . The rear wall  142  is provided to extend between a rear edge of the left wall  143  and a rear edge (see  FIG. 8 ) of the right wall  144 . 
         [0083]    The inner space of the movable waste ink tank case  111  is partitioned by the front wall  141 , the rear wall  142 , the left wall  143 , the right wall  144  and the lower wall  116 . 
         [0084]    As shown in  FIG. 11 , the movable waste ink tank case  111  is formed with two ribs  118  which project upward from the upper surface of the lower wall  116  and extend in the left and right direction  8 . The length of each rib  118  in the up and down direction  7  is approximately ⅓ of the length of the movable waste ink tank case  111  in the up and down direction  7 . Left edge and right edge of each rib  118  are connected the right surface of the left wall  143  and the left surface of the right wall  144 , respectively. The front wall  141 , the ribs  118  and the rear wall  142  are disposed to be spaced with respect to each other in the front and rear direction  8 . 
         [0085]    As shown on  FIGS. 7, 8 and 11 , in the inner space of the movable ink tank case  111 , the ink holding body  113  is provided. The ink holding body  113  is made of, for example, fiber materials such as a felt molded article. The waste ink flowed into the inner space of the movable waste ink tank case  111  is absorbed and held by the ink holding body  113  made of fiber materials. 
         [0086]    The ink holding body  113  has a rectangular parallelepiped shape, and is formed of a plurality of parts (two parts in this illustrative embodiment) as shown in  FIG. 8 . As shown in  FIG. 11 , the ink holding body  113  has a projecting part  121  which projects frontward in a region extending from the central portion to the lower portion at the front edge of the ink holding body  113 . The projecting part  121  has, at the front edge portion of an upper surface  121 A of the projecting part  121 , a hill part  122  which is formed to project upward from the upper surface  121 A of the projecting part  121 . In the upper portion of the front surface of the projecting part  121 , a forward tilting surface  123  is formed to be tilted with respect to the up and down direction  7  such that the tilting surface becomes higher toward the rear side. The upper edge portion of the forward tilting surface  123  forms the front surface of the hill part  122 . The degree of tilting of the forward tilting surface  123  becomes milder toward the rear side, and the forward tilting surface  123  continues to the upper end  122 A of the hill part  122 . At a rearward position with respect to the upper end  122 A on the hill part  122 , the rearward tilting surface  122 B is formed. The rearward tilting surface  122 B is inclined with respect to the up and down direction  7  such that the rearward tilting surface  122 B becomes lower toward the rear side. The hill part  122  is formed of the frontward tilting surface  123 , the upper end  122 A and the rearward tilting surface  122 B. 
         [0087]    On the rear side with respect to the hill part  122  on the upper surface  121 A of the projecting part  121 , a contact surface  124  is formed to be tilted with respect to the up and down direction  7  and to extend upward toward the rear side. The degree of tilting of the contact surface  124  becomes steeper toward the rear side. 
         [0088]    (Guide Parts  131  and  132 ) 
         [0089]    As shown in  FIG. 13 , the lower cover  30  has a pair of guide parts  131 , and the upper cover  29  has a pair of guide parts  132 . The guide parts  131  are disposed on the rear side with respect to the central portion in the space  35  (see  FIGS. 4 to 6 ) of the lower cover  30  in the front and rear direction  8  and on the lower side with respect to the movable waste ink tank  110  at the mounting position. Each of the guide parts  131  is formed to project upward from the upper surface  31 A of the lower wall  31  of the lower cover  30  and to extend in the front and rear direction  8 . The pair of guide parts  131  are disposed to be parallel with each other and to be spaced in the left and right direction  9 . The interval between inner surfaces  131 A of the pair of guide parts  131  facing with each other corresponds to the length of the movable waste ink tank  110  in the left and right direction  9 . The guide part  131  has a rectangular cross section in the left and right direction  9 . 
         [0090]    The pair of guide parts  132  are formed to project downward from the lower surface  29 A of the upper cover  29  on the upper side of the pair of guide parts  131 . The pair of guide parts  132  has the same shape as that of the pair of guide parts  131 , and are disposed at the same position as that of the pair of guide parts  131  in the front and rear direction  8  and the left and right direction  9 . The interval between inner surfaces  132 A of the pair of guide parts  132  facing with each other corresponds to the length of the movable waste tank  110  in the left and right direction  9 . 
         [0091]    In the state where the movable waste ink tank  110  is disposed at the mounting position, the lower edge portion of the left surface of the left wall  143  and the lower edge portion of the right surface of the right wall  144  respectively contact the inner surfaces  131 A of the guide parts  131 . In addition, the upper edge portion of the left surface of the left wall  143  and the upper edge portion of the right surface of the right wall  144  respectively contact the inner surfaces  132 A of the guide parts  132 . The movable waste ink tank  110  is movable in the front and rear direction  8  with respect to the front end position defined when the movable waste ink tank  110  is disposed at the mounting position by letting the lower edge portions of the left surface of the left wall  143  and the right surface of the right wall  144  slide with respect to the inner surfaces  131 A of the guide parts  131  and letting the upper edge portions of the left surface of the left wall  143  and the right surface of the right wall  144  slide with respect to the inner surfaces  132 A of the guide parts  132 . 
         [0092]    As shown in  FIG. 10 , in the fixed waste ink tank  80 , the rearward middle wall  95  is disposed slightly on the right side with respect to the frontward middle wall  94 . 
         [0093]    As shown in  FIG. 8 , the fixed waste ink tank  80  is configured such that an upper part  98 A of the right wall  98  formed on the upper side with respect to the central portion of the right wall  98  in the up and down direction  7  is disposed on the left side with respect to a lower part  98 B of the right wall  98  formed on the lower side with respect to the central part of the right wall  98  in the up and down direction  7 . With this configuration, in the central part of the right wall  98  in the up and down direction  7 , a horizontal part  98 C expanding in the front and rear direction  8  and the left and right direction  9  is formed. The lower edge part of the right wall  98  has an extended part  98 D formed to extend rearward. 
         [0094]    As shown in  FIG. 8 , the length between the right surface of the left wall  143  and the left surface of the right wall  144  corresponds to the length between the left surface of the rearward middle wall  95  of the fixed waste tank case  81  and the right surface of the upper part  98 A of the right wall  98 . The length between the left surface of the left wall  143  and the right surface of the right wall  144  corresponds to the length between the right surface of the frontward middle wall  94  and the left surface of the lower part  98 B of the right wall  98  of the fixed waste ink tank case  81 . 
         [0095]    As shown in  FIGS. 7 and 8 , in the state where the movable waste ink tank  110  is disposed at the mounting position, the front edge part of the right part  88  of the fixed waste ink tank  80  is disposed between the left wall  143  and the right wall  144  of the movable waste ink tank  80 . Furthermore, in this state, the lower edge part of the front edge part of the movable waste ink tank  110  is disposed between the lower part  98 B of the right wall  98  and the frontward middle wall  94  of the fixed waste ink tank  80 . In this state, the front edge of the left wall  143  of the movable waste ink tank  110  contacts the rear surface of the rear wall  93  of the left part  87  of the fixed waste ink tank  80 , and the front edge of the right wall  144  of the movable ink tank  110  contacts the rear edge of the horizontal part  98 C of the right wall  98  of the fixed waste ink tank  80 . As a result, the movable waste ink tank  110  is restricted from moving frontward with respect to the mounting position. 
         [0096]    In the state where the movable waste ink tank  110  is disposed at the mounting position, an engagement part (not shown) of the movable waste ink tank  110  and an engagement part (not shown) of the lower cover  30  engage with each other. As a result, in the state where the movable waste ink tank  110  is disposed at the mounting position, the movable waste ink tank  110  is prevented from being unintentionally moved rearward. An engagement part may be provided such that the movable waste ink tank  110  and the fixed waste ink tank  80  engage with each other. Furthermore, the movable waste ink tank  110  may be attached to the printer housing  11  by a screw. 
         [0097]    (Electrodes  134  and  135 ) 
         [0098]    As shown in  FIGS. 11 to 15 , the movable waste ink tank case  111  of the movable waste ink tank  110  includes an upper front wall  146 . The upper front wall  146  is formed to have a rectangular plate-like shape expanding in the up and down direction  7  and the left and right direction  9 . The upper front wall  146  is disposed at the front edge part of the upper edge part of the movable waste ink tank case  111 . In the state where the movable waste ink tank  110  is disposed at the mounting position, the upper front wall  146  is disposed at a rear position with respect to the rear wall  97  of the fixed waste ink tank  80 . 
         [0099]    As shown in  FIGS. 11 to 15 , the fixed waste ink tank  80  includes an electrode  134 . The electrode  134  is provided on a rear surface of the rear wall  97  of the fixed waste ink tank  80 . The movable waste ink tank  110  is provided with an electrode  135 . The electrode  135  is provided on a front surface of the upper front wall  146  of the movable waste ink tank case  111 . The electrodes  134  and  135  are electrically connected to a computing device. The computing device may be constituted, for example, by a CPU, a ROM, a RAM, etc. and may be a controller of the multifunction apparatus  10 . In the state where the movable waste ink tank  110  is disposed at the mounting position, the electrode  134  and the electrode  135  contact with each other and are brought into electrical conduction with each other. The computing device is able to detect electrical conduction between the electrode  134  and the electrode  135 . In response to the fact that the computing device detects electrical conduction between the electrode  134  and the electrode  135 , the computing device may display, on the operation panel  13 , a message indicating that the movable waste ink tank  110  has been properly attached. 
         [0100]    (Attaching of Movable Waste Ink Tank  110 ) 
         [0101]    The movable waste ink tank  110  is replaceable. In order to remove the movable waste ink tank  110 , a user withdraws rearward the movable waste ink tank  110  disposed at the mounting position via the opening  47  of the printer housing  11 . In order to attach the movable waste ink tank  110 , the user pushes the movable waste ink tank  110  toward the mounting position via the opening  47  of the printer housing  11 . 
         [0102]    When the movable waste ink tank  110  moves frontward toward the mounting position, the movable waste ink tank  110  reaches the mounting position shown in  FIG. 14  via a non-mounting position shown in  FIG. 12  and a contacting position shown in  FIG. 13 . 
         [0103]    As shown in  FIG. 12 , in the non-mounting position, the projecting part  107  of the ink holding body  83  of the fixed waste ink tank  80  extends downward. In this state, the lower edge  107 B of the rear surface  107 A of the projecting part  107  is disposed at an upper position with respect to a lower end  123 A of the forward tilting surface  123  of the ink holding body  113  of the movable waste ink tank  110  and at a lower position with respect to an upper end  122 A of the hill part  122 . 
         [0104]    When the movable waste ink tank  110  is moved frontward from the non-mounting position of the movable waste ink tank  110  shown in  FIG. 12 , the lower edge  107 B of the rear surface  107 A of the projecting part  107  contacts the forward tilting surface  123  of the ink holding body  113 . 
         [0105]    When the movable waste ink tank  110  is further moved frontward and reaches the contacting position of the movable waste ink tank  110  shown in  FIG. 13 , an upper end portion of the movable waste ink tank  110  further moves frontward while the lower edge  107 B of the rear surface  107 A is stopped and is in contact with the forward tilting surface  123 . Therefore, the projecting part  107  deforms and the lower portion of the projecting part  107  from the central portion in the up and down direction  7  bends frontward. 
         [0106]    When the movable waste ink tank  110  is further moved frontward from the contacting position of the movable waste ink tank  110  shown in  FIG. 13 , the projecting part  107  is further bent such that the lower end portion of the rear surface  107 A of the projecting part  107  slides rearward on the forward tilting surface  123  of the ink holding body  123  and climbs hill part  122  to reach the upper end  122 A. When the movable waste ink tank  110  is further moved frontward from this state, the rear surface  107 A of the projecting part  107  slides rearward on a rearward tiling surface  122 B of the hill part  122  to climb down the rearward tilting surface  122 B. When the movable waste ink tank  110  is further moved frontward, the rear surface  107 A of the projecting part  107  slides on the contact surface  124 , and the movable waste ink tank  110  reaches the mounting position of the movable waste ink tank  110  shown in  FIG. 14 . At the mounting position of the movable waste ink tank  110 , the rear surface  107 A of the projecting part  107  contacts the contact surface  124  to be along the inclination of the contact surface  124 . In this state, the projecting part  107  shows a restoring force in a restoring direction  150 . 
         [0107]    In the state where the movable waste ink tank  110  is disposed at the mounting position, the projecting part  107  of the ink holding body  83  of the fixed waste ink tank  80  contacts the contact surface  124  of the ink holding body  113  of the movable waste ink tank  110  in the up and down direction  7 . In this case, the projecting part  107  is disposed at an upper position, and the contact surface  124  is disposed at a lower position. In this state, as shown in  FIG. 18 , the projecting part  107  and the contact surface  124  contact with each other such that grooves  107 C of the projecting part  107  and grooves  124 A of the contact surface  124  engage with each other. Therefore, in comparison with a case where the grooves  107 C and the grooves  124 A are not provided, the projecting part  107  and the contact surface  124  contact with each other in a larger area. 
         [0108]    As shown in  FIG. 14 , in the state where the movable waste ink tank  110  is disposed at the mounting position, the waste ink flows into the inner space of the fixed waste ink tank  80  through the port  102 . First, in the inner space of the fixed waste ink tank  80 , the waste ink moves downward from the port  102  of the left part  87  while being held and absorbed by the ink holding body  83 , and then the lower portion of the left part  87  is filled with the waste ink. Then, the waste ink reaches the upper portion in the left part  87  with respect to the port  102  while passing through the ink holding body  83 , and reaches the ink holding body  83  with which the inner space of the right part  88  of the fixed waste ink tank  80  is filled. Then, the waste ink moves to the rear portion in the inner space of the right part  88  while passing through the ink holding body  83 , reaches the projecting part  107  of the ink holding body  83 , and moves downward to the lower edge  107 A of the projecting part  107 . Then, the waste ink moves to the ink holding body  113  of the movable waste ink tank  110  via the contacting surface  124  and is held and absorbed by the ink holding body  113 . Thereafter, the waste ink is further moves, in the movable waste ink tank  110 , from the front portion to the rear portion of the ink holding body  113 . As a result, the waste ink is absorbed and held by the ink holding body  113  of the movable waste ink tank  110 . 
         [0109]    In order to remove the movable waste ink tank  110 , the movable waste ink tank  110  is moved rearward from the mounting position. In this process, due to sliding friction between the ink holding body  83  and the ink holding body  113 , the upper edge portion of the projecting part  107  moves frontward in a state where the lower edge  107 B of the rear surface  107 A of the projecting part  107  does not move frontward. As a result, as shown in  FIG. 15 , the projecting part  107  bends such that the upper edge portion of the projecting part  107  is disposed at a frontward position with respect to the lower edge portion of the projecting part  107 . Then, the projecting part  107  is brought to a state where the rearward tilting surface  122 B of the hill part  122  of the ink holding body  113  and a front surface  107 D of the projecting part  107  contact with each other. When the movable waste ink tank  110  is moved rearward from this state, the projecting part  107  climbs over the upper end  122 A of the hill part  122  from the rear side to the front side while letting the front surface  107 D of the projecting part  107  slide on the rearward tilting surface  122 B of the hill part  122 . At this time, the hill part  122  wipes the waste ink absorbed in the projecting part  107 , and thereby the waste ink held in the projecting part  107  moves to the hill part  122  of the ink holding body  113 . As a result, when the movable waste ink tank  110  is disposed at the non-mounting position shown in  FIG. 12 , the waste ink is prevented from dropping downward from the lower edge of the projecting part  107 . 
       Advantageous Effects 
       [0110]    As described above, according to the illustrative embodiment, the direction (the front and rear direction  8 ) in which the movable waste ink tank  110  is moved by attaching and detaching of the movable waste ink tank  110  is different from the direction (the up and down direction  7 ) in which the ink holding body  84  contacts the ink holding body  113 . Further, in the state where the movable waste ink tank  110  is disposed at the non-mounting position, the position of the projecting part  107  of the ink holding body  83  and the position of the contact surface  124  of the ink holding body  113  overlap with each other in the up and down direction  7 . Therefore, occurrence of the situation where the ink holding body  83  and the ink holding body  113  do not contact with each other due to tolerance of components can be prevented. Furthermore, occurrence of the situation where the movable waste ink tank  110  is moved rearward with respect to the fixed waste ink tank  80  due to pressure caused by contact between the ink holding body  83  and the ink holding body  113  can be prevented. As a result, the ink holding body  83  and the ink holding body  113  securely contact with each other. 
         [0111]    Since the projecting part  107  elastically deforms and the rear surface  107 A contacts the contact surface  124 , it becomes possible to increase the contacting area between the projecting part  107  and the contact surface  124  in comparison with a case where the lower edge of the projecting part  107  contacts the contact surface  124 . 
         [0112]    In the process in which the movable waste ink tank  110  is moved rearward from the mounting position, the projecting part  107  is scraped by the hill part  122 . Therefore, the ink held by the projecting part  107  is wiped by the hill part  122 . As a result, it becomes possible to prevent the ink from falling to the outside of the movable waste ink tank  110 . Furthermore, the hill part  122  is disposed at the position on the front side with respect to the contact surface  124  of the ink holding body  113  to which the waste ink from the ink holding body  83  moves, the amount of waste ink held in the hill part  122  is smaller than the amount of waste ink held in the contact surface  124 . Therefore, the waste ink can be securely wiped by the hill part  122 . 
         [0113]    The contact surface  124  of the ink holding body  113  is inclined with respect to the up and down direction  7  such that the contact surface  124  becomes higher toward the rear side. Therefore, the inclination of the projecting part  107  matches the inclination of the contact surface  124 . Consequently, such a configuration makes it possible to increase the contacting area between the projecting part  107  and the contact surface  124 . 
         [0114]    The ink holding body  113  has, at the front edge thereof, the forward tilting surface  123  which is inclined with respect to the up and down direction  7  such that the forward tilting surface  123  becomes higher toward the rear side. Therefore, when the projecting part  107  contacts the ink holding body  113 , the projecting part  107  is lead to the upper surface of the ink holding body  113  by the forward tilting surface  123 . As a result, the impact applied to the projecting part  107  is reduced. Such a configuration makes it possible to prevent the ink held by the projecting part  107  from falling to the outside of the movable waste ink tank  110 . 
         [0115]    The lower end  123 A of the forward tilting surface  123  of the ink holding body  113  of the movable waste ink tank  110  at the non-mounting position is disposed at a lower position with respect to the lower edge  107 B of the projecting part  107 . Therefore, when the projecting part  107  contacts the ink holding body  113 , the projecting part  107  does not contact a surface extending in the up and down direction  7 . Therefore, the impact applied to the projecting part  107  is further reduced. 
         [0116]    The rear surface  107 A of the projecting part  107  of the ink holding body  83  and the contact surface  124  of the ink holding body  113  have the grooves  107 C and the  124 A extending in the front and rear direction  8 , respectively. Therefore, the contacting area between the projecting part  107  and the contact surface  124  can be increased in comparison with the case where the grooves  107 C and the  124 A are not provided. 
         [0117]    In the state where the movable waste ink tank  110  is disposed at the mounting position, the electrode  134  contacts the electrode  135 . Therefore, the situation where the movable waste ink tank  110  is attached to the mounting position can be easily detected. 
         [0118]    A part of the ink holding body  83  is disposed at an upper position with respect to the port  102 A. Therefore, t becomes easier to dispose the port  102  at a position lower than the caps  74  and  75 . As a result, the ink can be prevented from inversely flows into the caps  74  and  75 , 
         [0119]    (Variation) 
         [0120]    In the above described illustrative embodiment, the ink holding body  83  has the projecting part  107 ; however, the projecting part  107  may not necessarily be provided for the ink holding body  83 . For example, the lower surface of the ink holding body  83  may be configured to contact the upper surface of the ink holding body  113 . The ink holding body  83  may have a projection formed to project frontward, and the ink holding body  113  may have a recession formed to be recessed frontward. In this case, side surfaces of the projection in the up and down direction  7  and the left and right direction  9  may contact side surfaces of the recession in the up and down direction  7  and the left and right direction  9 . The forward tilting surface  123  may not necessarily be provided on the front edge of the ink holding body  113 . The lower end  123 A of the forward tilting surface  123  may not necessarily be disposed at a lower position with respect to the lower edge  107 B of the projecting part  107 . 
         [0121]    In the above described illustrative embodiment, the ink holding body  83  and the ink holding body  113  contact with each other in the up and down direction  7 . However, the ink holding body  83  and the ink holding body  113  may contact with each other in a different manner as long as a direction in which the ink holding body  83  and the ink holding body  113  contact with each other is intersecting with the moving direction of the movable waste ink tank  110 . That is, in a configuration where the movable waste ink tank  110  is attached or detached by moving in the up and down direction  7 , the ink holding body  83  and the ink holding body  113  may contact with each other such that the ink holding body  83  and the ink holding body  113  pushes with respect to each other in the up and down direction  7 , and at least one of the ink holding body  83  and the ink holding body  113  elastically deforms and contacts the other of the ink holding body  83  and the ink holding body  113  in the up and down direction  7 . 
         [0122]    The movable waste ink tank  110  may not have the movable waste ink tank case  111 , and the fixed waste ink tank  80  may not have the fixed waste ink tank case  81 . In this case, the surface of each of the ink holding body  83  and the ink holding body  113  may be subjected to the surface treatment such that the surface of each of the ink holding body  83  and the ink holding body  113  is covered with a film. For example, the surface treatment includes adhering of a film, coating of resin and melting of a surface by heat. 
         [0123]    In the above described illustrative embodiment, the electrodes  134  and  135  serving as a sensor are provided on the fixed waste ink tank  80  and the movable waste ink tank  110 , respectively. However, the sensor may not necessarily be formed of the electrodes  134  and  135 . For example, the sensor may be a mechanical sensor having a movable part provided such that, when the movable waste ink tank  110  is attached to the mounting position, the movable part moves to a particular position, or may be an optical sensor provided to block laser light when the movable waste ink tank  110  is attached to the mounting position 
         [0124]    In the above described illustrative embodiment, the carriage  67  is arranged on the recording head  65  and the carriage  67  is moved in the left and right direction  9 . In place of such a configuration, a recording head having the length longer than the width of the recording medium  19  in the left and right direction may be used. In such a configuration, the ink refilling case  61  and the ink cartridge  62  are disposed not to overlap with the recording head in the front and rear direction  8 , and a part of the ink refilling case  61  and the ink cartridge  62  is provided at a rightward position with respect to the recording head. In the left and right direction, the movable waste ink tank  110  is disposed to overlap with the ink refilling case  61  and the ink cartridge  62  and is disposed at a rightward position with respect to the recording head.