Abstract:
A liquid ejecting apparatus includes: a flow channel unit, having a liquid flow channel for supplying a liquid stored in a liquid cartridge; and a plurality of cartridge holders, including a first cartridge holder and a second cartridge holder adjacent to each other, and attached to the flow channel unit while the cartridge holders are arranged in a first direction, each of the cartridge holders adapted to hold the liquid cartridge and having a first engaging portion and a second engaging portion. The first engaging portion of the first cartridge holder and the second engaging portion of the second cartridge holder are engageable with each other to lock the first and second cartridge holders, and the first engaging portion of the first cartridge holder and the second engaging portion of the second cartridge holder are disengageable from each other to unlock the first and second cartridge holders when one of the first and second cartridge holders is moved in a second direction that is apart from the flow channel unit.

Description:
BACKGROUND 
     1. Technical Field 
     The present invention relates to a liquid ejecting apparatus which is provided with a cartridge holder attaching section on which a plurality of cartridge holders for holding a cartridge storing liquid such as ink are attached. 
     2. Related Art 
     In related art, as a typical example of a liquid ejecting apparatus, an ink jet recording apparatus having a recording head that performs printing by discharging ink droplets to a recording media from nozzles has been widely used. 
     The recording apparatus is provided with a carriage and a recording head loaded on the carriage and performs printing on the recording media by discharging the ink droplets from the nozzles formed on the recording head while shifting the carriage relative to the recording media. 
     There is widely used a recording apparatus having a plurality of cartridge holders provided therein for housing and holding a plurality of ink cartridges storing print ink (for example, see JP-A-2006-116793). 
     The ink cartridges may house an ink pack storing the ink in a cartridge case. Pressurization air is applied into the cartridge case and thus, the ink pack is placed under pressure, whereby the ink is ejected from an ejection member (an ink supply needle) and is supplied to the recording head. 
     For example, as shown in  FIG. 16 , cartridge holders  100  housing the ink cartridges have a substantially rectangular thin packing body  101  and an ink cartridge housing space housing the ink cartridges therein. In the cartridge holders  100  shown in  FIG. 16 , a plurality of (here, for example, three packing bodies) packing bodies  101  each have one side surface opened and are laminated and mounted with a side plate  102  to form three cartridge housing spaces. Openings  103  for attaching and detaching the ink cartridges are provided on a front surface (a right inner side surface in  FIG. 16 ) of each cartridge holder  100 . On rear walls  104  of the cartridge holders  100 , there are provided holding portions  105  for holding air supply members for introducing air in the ink cartridges or holes  106  holding the ink supply needle for emitting the ink from the ink cartridges. 
     However, as shown in  FIG. 17 , a plurality of cartridge holders  100  shown in  FIG. 16  are laminated and integrally used so as to house ink cartridges each storing ink of different colors and have the wrong insertion prevention structure for allowing only ink cartridges of predetermined colors to be mounted for each cartridge holder  100 . Accordingly, mutual attaching positions of the cartridge holders  100  are also predetermined so as to supply ink of a correct color to a recording head of a recording apparatus. As a result, as shown in  FIG. 16 , locking claws  107  and locking concave portions  108  are provided at different positions of each of the cartridge holders  100  so as not to attach the cartridge holders  100  in an order other than a proper lamination order. 
     In a bottom cartridge holder  100  shown in each of  FIGS. 16 and 17 , a locking claw  107 A for locking the cartridge holder  100  above the bottom cartridge holder  100  (a second step from the downside) is provided, and in a second-step cartridge holder  100 , a locking concave portion  108 B with which only the bottom locking claw  107 A can engage is provided. In the second-step cartridge holder  100 , a locking claw  107 B for locking a third-step cartridge holder  100  is provided, and in the third-step cartridge holder  100 , a locking concave portion  108 C with which only the second-step locking claw  107 B can engage is provided. 
     Similarly, in the third-step cartridge holder  100 , the locking claw  107 C for locking the third-step cartridge holder  100  is provided, and a locking concave portion  108 D with which only the third-step locking claw  107 C can lock is provided. A plurality of cartridge holders in a state shown in  FIG. 17  are mounted and used integrally with a flow channel unit having ink flow channels. 
     By this configuration, the cartridge holders  100  can be relatively attached on and detached from each other only in a vertical direction. As a result, as shown in  FIG. 17 , assuming that a cartridge holder  100  in the middle (in a center) of a plurality of integrated cartridge holders  100  breaks down, it is difficult to directly take out only the broken cartridge holder  100 . 
     Assuming that one cartridge holder is removed, complicated steps for removing all cartridge holders from the flow channel unit on which the plurality of cartridge holders are attached and disassembling them into individual cartridge holders are required, which is inconvenient. 
     SUMMARY 
     An advantage of some aspects of the invention is to provide a liquid ejecting apparatus in which even a middle cartridge holder can be individually taken out from a structure of the plurality of cartridge holders on which the cartridge holders are mounted in parallel. 
     An aspect of the invention provides a liquid ejecting apparatus comprising: a flow channel unit, having a liquid flow channel for supplying a liquid stored in a liquid cartridge; and a plurality of cartridge holders, including a first cartridge holder and a second cartridge holder adjacent to each other, and attached to the flow channel unit while the cartridge holders are arranged in a first direction, each of the cartridge holders adapted to hold the liquid cartridge and having a first engaging portion and a second engaging portion, wherein the first engaging portion of the first cartridge holder and the second engaging portion of the second cartridge holder are engageable with each other to lock the first and second cartridge holders, and the first engaging portion of the first cartridge holder and the second engaging portion of the second cartridge holder are disengageable from each other to unlock the first and second cartridge holders when one of the first and second cartridge holders is moved in a second direction that is apart from the flow channel unit. 
     In the recording apparatus configured above, the plurality of cartridge holders are attached to the flow channel unit having the liquid flow channels and air flow channels formed therein with the adjacent cartridge holders locked by the first engaging portion and the second engaging portion. 
     In the first engaging portion and the second engaging portion, the adjacent cartridge holders are locked with each other in a state where the cartridge holders are slidable in an attaching direction to the flow channel unit and in the opposite direction so as to movably guide the cartridge holders. Accordingly, even when any one of the plurality of cartridge holders is removed, it is possible to individually move and remove an arbitrary cartridge holder in a direction (that is, a removing direction) distant from the flow channel unit with other cartridge holders remaining attached to the flow channel unit. By this configuration, a procedure of removing all the cartridge holders from the flow channel unit on which the plurality of cartridge holders are mounted and disassembling them into individual cartridge holders in the related art are not required, whereby workability is improved. 
     It is preferable that the first engaging portion and the second engaging portion are disposed on a side apart from the flow channel unit since the cartridge holders are attached to the flow channel unit. 
     When at least one of the first engaging portion and the second engaging portion of the second cartridge holder is protruded toward the first cartridge holder, the first cartridge holder may preferably include a notch that has a depth larger than a protrusion height of the at least one of the first engaging portion and the second engaging portion of the second cartridge holder. The notch is positioned to a side of the flow channel unit with respect to at least one of the second engaging portion and the first engaging portion of the first cartridge holder, and the at least one of the first engaging portion and the second engaging portion of the second cartridge holder can pass therethrough in a direction perpendicular to the first direction. 
     In this case, the arbitrary cartridge holder is slightly moved in the removing direction when the plurality of cartridge holders are locked with each other and then, the arbitrary cartridge holder can be moved in a direction perpendicular to the removing direction, whereby even the middle cartridge holder adjacent both the upper and lower other cartridge holders can be easily taken out individually. Shapes of the side walls are designed so that the cartridge holders do not interfere with each other in the overall attachment direction length when assuming that the amount of movement required for removal extends throughout the overall attachment direction length of the cartridge holders. In accordance with this configuration, movement in the attachment direction is finished in a short movement, and design flexibility of the cartridge holders is improved. Further it is preferable that the first engaging portion is a locking claw which is provided at a first end portion in the first direction, and the second engaging portion is a receiving portion which protrudes from a second end portion opposing the first end portion in the first direction and which engages with the locking claw, since simple structure can be achieved. 
     It is preferable that the receiving portion has: a receiving piece of an L shape which protrudes from a wall surface; and a protrusion which is disposed on an open side of the receiving piece that blocks a movement of the locking claw engaging with the receiving portion toward the open side. 
     In the locking mechanism configured above, since the cartridge holders can be supported in parallel by the receiving piece and movements of the locking claws in a direction (a width direction of the cartridge holder) perpendicular to the attachment direction can be prevented by the protrusions, deformation such as inward fall-down of the side walls of the cartridge holders can as inward fall-down of the side walls of the cartridge holders can be prevented without movement of the locking claws in the width direction of the cartridge holder when the locking claws are locked with the receiving portions. Since the protrusions can be smaller than the receiving pieces, the protrusions can also pass through the notches with the receiving pieces. Accordingly, it becomes possible to take out the cartridge holders in a transverse direction. 
     An identification mechanism that allows the cartridge holder to be attached to the flow channel unit when the cartridge holder is disposed on a predetermined position of the flow channel unit and does not allow the cartridge holder to be attached to the flow channel unit when the cartridge holder is disposed on a position other than the predetermined position of the flow channel unit may be further provided. 
     In addition, it is preferable that the identification mechanism comprises an identification engaging portion of the cartridge holder and an identification engaging portion of the flow channel unit at a face at which the cartridge holder and the flow channel unit are opposed to each other, and each of the cartridge holders has the identification engaging portion that is different from those of the other cartridge holders. 
     Even if each of the cartridge holders is attached to a position other than the predetermined position of the flow channel unit, it is possible to prevent false attachment of each of the cartridge holders. It is possible to easily manufacture different cartridge holders by exchanging only a part corresponding to an identifying concave-convex portion in a die at the time of molding each of the cartridge holders. Consequently, since a dedicated die is not required to be provided for each of the cartridge holders, a decrease in manufacturing costs can bereduced. 
     It is preferable that the cartridge holder is prevented from being attached to the flow channel unit by an interference of the identification engaging portion of the flow channel unit that allows one of the other cartridge holders to be attached thereto when the cartridge holders are disposed at a position other than the predetermined position of the flow channel unit since each of the cartridge holders cannot be attached to the position other than the predetermined position of the flow channel unit by an interference of the identifying engaging portion of each cartridge holder and the identifying engaging portion of the flow channel unit even when intending to attach each of the cartridge holders to the position other than the predetermined position of the flow channel unit. 
     It is preferable that the identification mechanism comprises a combination of a plurality of protrusions. In addition, the identification engaging portion of the cartridge holder has a plurality of protrusions arranged in a different manner from the other cartridge holders, and the identification engaging portion of the flow channel unit has at least one protrusion provided at a position which does not interfere with only the protrusions of the cartridge holder to be attached thereto. 
     In the attaching structure of the cartridge holders configured above, the identifying mechanism is constituted by the plurality of protrusions, and thus the position of the cartridge holder and the position of the flow channel unit correspond to each other by changing combination structures (positions or shapes) of the holder protrusions and the flow channel protrusions, whereby it is possible to easily manufacture different cartridge holders just by changing a die component in a part in which the protrusions are formed at the time of molding each of the cartridge holders. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       These and other aspects will be described with reference to the accompanying drawings, wherein like numbers reference like elements. 
         FIG. 1  is an external perspective view of a publisher (a media processing apparatus) to which a liquid ejecting apparatus according to an exemplary embodiment of the present invention is applied. 
         FIG. 2  is a perspective view illustrating a state in which a case of a publisher is removed as viewed from a front side. 
         FIG. 3  is a perspective view illustrating a state in which a case of a publisher is removed as viewed from a rear side. 
         FIG. 4  is a perspective view of a liquid ejecting apparatus installed in a publisher. 
         FIG. 5  is an internal schematic configuration diagram of a publisher. 
         FIG. 6  is a perspective view of an ink supplying mechanism part as viewed from a side. 
         FIG. 7  is a perspective view of an ink supplying mechanism part in a rear view. 
         FIG. 8  is an exploded perspective view of an ink supplying mechanism part. 
         FIG. 9  is a perspective view of a flow channel unit as viewed from a front side. 
         FIG. 10  is a perspective view illustrating an example of an ink cartridge. 
         FIG. 11A  is a perspective view of a cartridge holder as viewed from a top side, and  FIG. 11B  is a perspective view of a locking claw. 
         FIG. 12A  is a perspective view of a cartridge holder as viewed from a bottom side, and  FIG. 12B  is a perspective view of a receiving section. 
         FIGS. 13A and 13B  are a side view and a front view illustrating a process of taking out a cartridge holder at a middle position. 
         FIG. 14  is a perspective view of a cartridge holder. 
         FIGS. 15A to 15F  are a partially enlarged perspective view illustrating an arrangement example of identification protrusion protrusions different for each cartridge holder. 
         FIG. 16  is an exploded perspective view illustrating an example of a known cartridge holder. 
         FIG. 17  is a perspective view illustrating an example of a structure in which a known cartridge holder is mounted. 
     
    
    
     DESCRIPTION OF EXEMPLARY EMBODIMENTS 
     Hereinafter, an exemplary embodiment of a liquid ejecting apparatus which is provided with a cartridge holder will be described with reference to the accompanying drawings. 
     In the exemplary embodiment, a case in which a liquid ejecting apparatus is applied to a publisher as a media processing apparatus is exemplified. 
       FIG. 1  is an external perspective view of the publisher (the media processing apparatus),  FIG. 2  is a perspective view of the publisher of which case is removed as viewed from the front side,  FIG. 3  is a rear perspective view of the publisher of which case is removed,  FIG. 4  is a perspective view of the liquid ejecting apparatus installed in the publisher, and  FIG. 5  is an internal schematic configuration diagram of the publisher. 
     A publisher  1  is the media processing apparatus performing writing data in disk-like media such as CDs and DVDs and printing on label surfaces of the media. The publisher  1  is provided with a substantially rectangular parallelepiped-shaped case  2 . Sliding doors  3  and  4  which can be opened and closed in a lateral direction are attached onto a front surface of the case  2 . An operation surface  5  having display lamps, operation buttons, and the like arranged thereon is provided in an upper right end portion of the case  2 , and a media discharge port  6  is provided in a lower end of the case  2 . 
     The right sliding door  3  is locked in a closed state, and a biometric reading section (not shown) such as a fingerprint sensor is disposed on the operation surface  5  as viewed from a front side, whereby only a person which is registered beforehand can open and close the right sliding door  3 . The sliding door  3  can be opened and closed even by a command received from a superior apparatus  97  (see  FIG. 5 ) (to be described later) communicably connected with the publisher  1 . 
     As shown in  FIG. 2 , the left sliding door  4  is opened at the time of exchanging an ink cartridge  12  of a label printer (a liquid ejecting apparatus)  11  as viewed from a front side, and when the sliding door  4  is opened, a cartridge attaching section  14  having a plurality of cartridge holders  13  arranged in a vertical direction is exposed. 
     As shown in  FIG. 3 , a blank media storing section  21  capable of stacking a plurality of sheets of unused blank media MA in which data writing processing is not performed, and a prepared media storing section  22  in which prepared media MB are stored are vertically disposed on the same shaft in the case  2  of the publisher  1 . When media MC which is unnecessary is disposed, the unnecessary media MC is set in the prepared storing section  22 . 
     The blank media storing section  21  is provided with a slide plate  23  which can be drawn out horizontally to the front side and a pair of right and left circular-shaped frame plates  24  and  25  which are disposed vertically on the slide plate  23 . The slide plate  23  and the pair of frame plates  24  and  25  constitute a stacker which can receive the blank media MA from above and house the blank media MA while laminating it on the same shaft. Housing the blank media MA in the blank media storing section  21  or replenishing the blank media storing section  21  with the blank media MA can be easily performed by opening the sliding door  3  and drawing out the slide plate  23 . 
     The lower prepared media storing section  22  also has the same structure as the blank media storing section  21  and is provided with a slide plate  26  which can be drawn out horizontally to the front side and a pair of right and left circular-shaped frame plates  27  and  28  which are disposed vertically on the slide plate  26 . The slide plate  26  and the pair of frame plates  27  and  28  constitute a stacker which can receive the prepared blank media MA or the unnecessary media MC from above and house the blank media MA or the unnecessary media MC while laminating it on the same shaft. 
     A disposal action may be performed by opening the sliding door  3  and setting the unnecessary media MC in the prepared media storing section  22  at the time of disposing the unnecessary media MC. The prepared media MB (that is, media in which writing of data and printing on the label surface are finished) may be taken out from the sliding door  3 . 
     A media transporting mechanism  31  is disposed in the rear of the blank media storing section  21  and the prepared media storing section  22 . The media transporting mechanism  31  is provided with a chassis  32  vertically attached to the case  2 , a vertical guide shaft  35  extending vertically between horizontal supporting plate sections  33  and  34  above and below the chassis  32 , and a media carrier  36  attached to the vertical guide shaft  35 . The media carrier  36  can move up and down along the vertical guide shaft  35  by a driving motor  37 , and the media carrier  36  can turn right and left on the vertical guide shaft  35 . Media transported to the media discharge port  6  by the media transporting mechanism  31  can be taken out from the media discharge port  6  to the outside. 
     Two media drives  41  laminated vertically are disposed in lateral parts of the upper and lower storing sections  21  and  22 , and the media transporting mechanism  31  and a carriage  62  (see  FIG. 4 ) of a label printer  11  (to be described later) is movably disposed below the media drives  41 . 
     The media drives  41  each have media trays  41   a  which can move between a position at which the data are written in the media and a media receipt position at which the media are delivered and received. 
     The label printer  11  has a media tray  51  which can move between a position at which label printing can be performed onto the media label surface and the media receipt position at which the media are delivered and received. 
     In  FIGS. 2 and 3 , the media tray  41   a  of the upper media drive  41  is drawn out forward and is placed at the media receipt position, and the media tray  51  of the lower label printer  11  is placed at an inner position at which the label printing can be performed. The label printer  11  is preferably an ink jet printer. Ink cartridges  12  corresponding to various colors (six colors such as black, cyan, magenta, yellow, light cyan, and light magenta) are used as an ink supplying mechanism  71 , and the ink cartridges  12  are mounted on the cartridge holders  13  of the cartridge attaching section  14  from the front side. 
     Gaps in which the media carrier  36  of the media transporting mechanism  31  can move up and down are formed between a pair of right and left frame plates  24  and  25  of the blank media storing section  21  and between a pair of right and left frame plates  27  and  28  of the prepared media storing section  22 . The media carrier  36  of the media transporting mechanism  31  turns horizontally between the upper and lower blank media storing section  21  and the prepared media storing section  22 , and the gaps are positioned so that the media carrier  36  can be positioned just above the prepared media storing section  22 . When the media tray  41   a  is pushed into the media drive  41 , the media carrier  36  of the media transporting mechanism  31  moves down and thus, it is accessible to the media tray  51  placed at the media receipt position. Accordingly, the media can be transported to each section by a combination of actions of moving up and down and turning right and left of the media carrier  36 . 
     A disposal stacker  52  for storing disposal media MD is disposed below the media receipt position of the media tray  51 , and approximately 30 sheets of disposal media MD can be stored in the disposal stacker  52 . The disposal media MD can be supplied to the disposal stacker  52  by the media carrier  36  of the media transporting mechanism  31  while the media tray  51  is retreated to a data writing position from the media receipt position above the disposal stacker  52 . 
     By this configuration, the media including the CD or the DVD are transported among the blank media storing section  21 , the prepared media storing section  22 , the disposal stacker  52 , the media tray  41   a  of the media drive  41 , and the media tray  51  of the label printer  11  by the media carrier  36  of the media transporting mechanism  31 . 
     A media disposal mechanism  92  (see  FIG. 5 ) is attached to a front side of the label printer  11 . The media disposal mechanism  92  protrudes a protruding portion with a driving mechanism such as a plunger, contacts the protruding portion with media loaded on the media tray  51  which moves back and forth, and mechanically destroys recording surfaces of the media to disable writing and reading. 
     Next, a configuration of the label printer  11  will be described. 
     As shown in  FIGS. 2 to 4 , the label printer  11  is provided with the carriage  62  having an ink jet head  61  supported to reciprocate horizontally along a carriage guide shaft  63 . The carriage  62  is provided with a timing belt  64  extending horizontally along the carriage guide shaft  63  and a carriage motor  65  for driving the timing belt  64 . 
     A nozzle surface of the ink jet head  61  loaded on the carriage  62  is inclined downward, and the media tray  51  can reciprocate back and forth horizontally below the ink jet head  61 . A right end of the media tray  51  is supported by a guide shaft  66  extending back and forth horizontally, and a left end of the media tray  51  is supported by a guide rail  67  slidably extending back and forth horizontally. A driving mechanism of the media tray  51  is also provided with a timing belt (not shown) extending back and forth horizontally and a tray motor for driving the timing belt not shown. 
     The label printer  11  is provided with the ink supplying mechanism  71  having a cartridge attaching section  14  on which the ink cartridges  12  are mounted. The ink supplying mechanism  71  has a vertical structure. The ink supplying mechanism  71  is supported and placed in a vertical direction on a base  72  of the publisher  1 . One end of a flexible ink supplying tube  73  is connected to the ink supplying mechanism  71 , and the other end of the ink supplying tube  73  is connected to the carriage  62 . 
     Ink of the ink cartridges  12  of the ink supplying mechanism  71  is supplied to the carriage  62  through the ink supplying tube  73 , and the ink is supplied to the ink jet head  61  through a damper unit and a back-pressure regulating unit (not shown) which are provided in the carriage  62 . 
     A pressurizing mechanism  74  is provided above the ink supplying mechanism  71 . The pressurizing mechanism  74  pressurizes the ink cartridges  12  and discharges ink accumulated in ink packs of the ink cartridges  12 . 
     An ink absorbing mechanism  81  is provided below a home position (a position shown in  FIG. 4 ) of the carriage  62 . The ink absorbing mechanism  81  is provided with a cap  82  covering the nozzle of the ink jet head  61  exposed to a lower surface of the carriage  62  disposed at the home position and a waste ink absorbing pump  83  absorbing waste ink discharged to the cap  82  by a head cleaning action of the ink jet head  61  or an ink filling action of the ink jet head  61 . 
     The waste ink absorbed by the waste ink absorbing pump  83  of the ink absorbing mechanism  81  is fed to a waste ink absorbing tank  85  through a tube  84 . 
     In the waste ink absorbing tank  85 , an absorber (not shown) is placed in a case  86 , and a top surface of the waste ink absorbing tank  85  is covered with a cover  88  having a plurality of hole portions  87 . 
     A waste ink receiving section  89  as a part of the waste ink absorbing tank  85  is provided below the waste ink absorbing mechanism  81 . The waste ink receiving section  89  receives the waste ink dripped from the waste ink absorbing mechanism  81  and absorbs the waste ink with the absorber. 
     The media tray  51  is provided with a circular shallow concave portion  51   a  for loading the media on a top surface of a rectangular plate thereof. Three vertical claws (not shown) concentrically disposed a 120 degree interval are provided in a center of the concave portion  51   a . Two vertical claws of three vertical claws can integrally move in a radial direction, and one vertical claw is disposed at a fixed position. Two vertical claws can be moved by a driving mechanism such as an electronic solenoid (not shown). 
     When the media are dropped to the concave portion  51   a  from above with a label surface on which a label is printed facing up, three vertical claws are inserted into center holes of the media. Thereafter, when two vertical claws are slightly moved to the outside in the radial direction, the three vertical claws are tightly pressed against inner peripheral surfaces of the center holes of the media from the inside. By this configuration, the media are held in the media tray  51 . In this state, the media tray  51  is moved to a rear side along the guide shaft  66  by driving a tray motor (not shown) and thus, it can be moved to a printing area of the ink jet head  61 . Thereafter, predetermined printing can be performed on the label surfaces of the media by the ink jet head  61 . 
     The waste ink absorbing tank  85  is disposed below the printing area of the ink jet head  61 , and the ink dripped from the ink jet head  61  is received by the waste ink absorbing tank  85 . 
     Next, an internal configuration of the publisher  1  will be described. 
     As shown in  FIG. 5 , the publisher  1  includes a central control part which has a control section  91  conducting control of each section and performs operation control between the sections in the publisher  1 . Specifically, the central control part controls operations of the media drive  41 , the label printer  11 , and the media transporting mechanism  31 . 
     The publisher  1  is provided with a media disposal mechanism  92  for disposing the unnecessary media MC which becomes unnecessary after preparation in a state of inability to write and read the data in addition to a function for preparing the media, an image sensor  93  formed of a line sensor having a CCD for reading print images on the label surfaces of the unnecessary media MC disposed by the media disposal mechanism  92 , and a storage section  94  for storing the print images of the read label surfaces as a media disposal history  94   a  by the media disposal mechanism  92 . 
     As described above, the media disposal mechanism  92  mechanically damages recording surfaces of the unnecessary media MC by using movement of the media tray  51  in the label printer  11  and thus, it changes the unnecessary media MC to the waste media MD in which reading and writing of the data is disabled. 
     The image sensor  93  for reading the print images on the label surfaces is loaded on the media transporting mechanism  31 , for example. All the print images of the label surfaces are read by the image sensor  93  disposed in the radial direction of the media with a light receiving surface facing the label surfaces of the media MC by rotating the unnecessary media MC gripped to the media transporting mechanism  31 . Alternatively, all the print images of the label surfaces may be read by rotating the image sensor  93  disposed in the radial direction of the media on the label surfaces of the unnecessary media MC gripped to the media transporting mechanism  31 . 
     An operating section  95  is connected to the control section  91 , and alphanumeric key groups such as numeric keys for inputting authentication passwords, various function key groups, and indicator groups such as status display lamps are disposed in the operating section  95 . The control section  91  is connected to the main apparatus  97  through a communication interface  96  by dedicated communication lines or general communication lines. In general, media preparing actions (a data writing action and a label surface printing action), a media disposal history preparing action (a label surface print image reading action), and a media disposal action come to start based on a media preparation command, a media disposal command, and the like supplied to the control section  91  from the main apparatus  97 . 
     Next, a detailed structure of the ink supplying mechanism  71  constituting the label printer  11  in the publisher  1  will be described. 
       FIG. 6  is a perspective view of the ink supplying mechanism as viewed from a side,  FIG. 7  is a perspective view of the ink supplying mechanism as viewed from a front side,  FIG. 8  is an exploded perspective view illustrating the ink supplying mechanism,  FIG. 9  is a perspective view of a flow channel unit as viewed from a front side,  FIG. 10  is a perspective view of the ink cartridge,  FIG. 11A  is a perspective view of the cartridge holder as viewed from a top side,  FIG. 11B  is an enlarged perspective view of the locking claw,  FIG. 12A  is a perspective view of the cartridge holder as viewed from a bottom side,  FIG. 12B  is an enlarged perspective view of the locking concave portion,  FIGS. 13A and 13B  are a side view and a front view illustrating a process of taking out the cartridge holder at a middle position,  FIG. 14  is a perspective view of the cartridge holder, and  FIGS. 15A to 15F  are perspective views illustrating arrangement examples of identification protrusions different for each cartridge holder. 
     As shown in  FIGS. 6 and 7 , the ink supplying mechanism  71  has a frame  110  placed vertically to the base  72  (see  FIGS. 2 to 4 ) of the publisher  1 . The frame  110  is formed in an L shape in a cross-section view by bending and machining a steel plate. The frame  110  has a cartridge attachment plate part  111  and a valve unit attachment plate part  112 . A substrate attachment plate part  113  above which a circuit substrate  118  is installed is horizontally formed in the frame  110 . 
     The plurality of cartridge holders (for example, six cartridge holders in the exemplary embodiment)  13  constituting the cartridge attaching section  14  are fixed to the cartridge attachment plate part  111  through a plate-like flow channel unit  114 . The ink cartridges  12  of the colors in which inks of colors such as black, cyan, magenta, yellow, light cyan, and light magenta are stored can be mounted on and demounted from the cartridge holders  13 . The cartridge holders are generally represented by “the cartridge holder  13 ,” and when the laminated cartridge holders are distinguished and represented, a cartridge holder which is located in the bottom end is represented by “a cartridge holder  13 A” and then, the following cartridge holders sequentially laminated thereon are represented by “a cartridge holder  13 B”, “a cartridge holder  13 C”, “a cartridge holder  13 D”, “a cartridge holder  13 E”, and “a cartridge holder  13 F”. 
     As shown in  FIGS. 8 and 9 , the flow channel unit  114  provided between the cartridge attachment plate part  111  of the frame  110  and the cartridge holder  13  is formed in a plate shape and preferably made of synthetic resin. An ink flow channel and an air flow channel are formed therein. Ink emission sections  53  and air supplying member insertion holes  54  are vertically provided in the flow channel unit  114  in correspondence with air supplying member holding sections  45   a  and ink supplying needle holding sections  45   b  (see  FIG. 12 ) of the cartridge holder  13  of the cartridge attaching section  14 . One screw hole  55   a  and two screw holes  55   b  are provided in correspondence with screw holes  47   a  and  47   b  (see  FIG. 12 ) of the cartridge holder  13 . 
     An air introduction port  56  for introducing pressurization air is provided in an upper end portion of the flow channel unit  114 , and a pipe-shaped air flow channel  57  is disposed facing downward. The air flow channel  57  is branched at a position corresponding to each cartridge holder  13  and is led to a rear surface. The air flow channel  57  is connected to the air supplying member mounted on the air supplying member holding section  45   a  of the cartridge holder  13  in each step through a pipe  58  (see  FIG. 7 ) from the rear surface. The pipe  58  passes through the air supplying member insertion hole  54  from the rear surface, and the pipe  58  is disposed on a front surface. 
     An ink supplying needle (not shown) is attached to an inner side of the cartridge holder  13  in the ink emission section  53 . The ink flow channels which are in communication with the ink emission section  53  are provided in the flow channel unit  114 , and ink pumped from the ink cartridges  12  is led to the front surface of the frame  110  and is transported to a valve unit  122  mounted on the frame  110  through a connection tube  124  as shown in  FIG. 7 . The valve unit  122  is removably attached to a valve unit attachment plate part  112  of the frame  110  and has choke valves  121  corresponding to the ink cartridges  12  mounted on the cartridge holders  13 . 
     As shown in  FIG. 7 , the valve unit  122  includes a plurality of connection pipes  127  protruding toward a side opposite a side in which the connection tube  124  is mounted. The connection pipes  127  are arranged substantially at a middle height position of the valve unit  122  at narrow intervals, and each of the connection pipes  127  is in communication with the corresponding choke valve  121 . A flexible ink supplying tube  73  (see  FIG. 4 ) connected to the carriage  62  is in communication with the connection pipes  127 . 
     As shown in  FIG. 9 , flow channel identification sections  59  are provided at positions opposite cartridge holder identifying sections  44  (see  FIGS. 8 and 12 ) provided on the cartridge holder  13  in each step on a front surface  114   a  onto which the cartridge holder  13  is attached in the flow channel unit  114 . The cartridge holder identifying sections  44  and the flow channel identification sections  59  have a protrusion structure in which they do not interfere with each other only when a proper cartridge holder  13  is attached. When a wrong cartridge holder  13  is attached, the protrusions of the cartridge holder identifying section  44  and the flow channel identification section  59  interfere with each other, and the cartridge holder  13  cannot be mounted. It is thus possible to easily identify an incorrectly mounted cartridge. 
       FIG. 10  illustrates an example of the ink cartridge  12  housed in the cartridge holder  13 . 
     The ink cartridge  12  has a substantially rectangular parallelepiped-shaped cartridge case  151 , and a pair of air chambers separated by a partition plate are formed in the cartridge case  151 . Ink packs  153  storing the ink are housed in the air chambers. 
     Ink emission members  154  which are in communication with interior portions of the ink packs  153  are provided in the ink packs  153 . Attachment holes  155 , which allow an inside and an outside of the cartridge case  151  to be in communication with each other, are provided in a central portion of a rear surface  151   a  of the cartridge case  151 , and emission ports  154   a  of the ink emission members  154  are exposed through the attachment holes  155 . The ink supplying needle disposed in the cartridge holder  13  is inserted into the emission port  154   a , and the ink is emitted through the ink supplying needle. Air introduction holes  156  for injecting the air in the air chambers are provided adjacent the attachment holes  155  on the rear surface  151   a  of the cartridge case  151 . A pair of insertion holes  157  are provided between the attachment holes  155  and the air introduction holes  156  on the rear surface  151   a  of the cartridge case  151 . Positioning members in the cartridge holder  13  are inserted into the insertion holes  157  and are not in communication with an internal space of the cartridge case  151 . 
     An IC chip  158  is provided in a front end portion of one surface of the cartridge case  151 . The IC chip  158  is electrically connected to the control section  91  of the publisher  1  when the ink cartridge  12  is inserted and mounted into the cartridge holder  13 . Information on the kind or the remaining amount of the ink in each of the ink packs  153  is stored in the IC chip  158 . 
     In the ink cartridge  12 , the pressurization air is introduced to the air chambers from the air introduction holes  156  of the cartridge case  151  and thus, the ink packs  153  are placed under pressure, whereby the ink stored in the ink packs  153  is pumped through the ink emission members  154 . 
     As shown in  FIGS. 11A and 12A , in the cartridge holder  13  housing the above-mentioned ink cartridges  12 , openings  43  for taking the ink cartridge  12  in and out are provided on a front surface thereof, and the cartridge holder  13  is formed in the shape of a substantially rectangular parallelepiped box of which the top surface is opened. The air supplying member holding sections  45   a  holding the air supplying members for injecting the air in the air chambers of the ink cartridges  12  are provided on the rear surface  13   a  of the cartridge holder  13  in correspondence with the air introduction holes  156  of the ink cartridges  12 . The ink supplying needle holding sections  45   b  are provided in correspondence with the ink emission members  154  for pushing the ink from the ink cartridges  12  by injection of the air. The air supplying member holding sections  45   a  and the ink supplying needle holding sections  45   b  each are provided in two steps in correspondence with configurations of the ink cartridges  12 . The screw hole  47   a  for fixing the cartridge holder  13  to the flow channel unit  114  and the screw hole  47   b  for fixing the cartridge holder  13  in which the flow channel unit  114  is inserted to the frame  110  are provided. In the exemplary embodiment, for example, the screw hole  47   a  is provided in one location, and the screw holes  47   b  are provided in two locations. 
     The cartridge holder identifying sections  44  for identifying proper attaching positions of the cartridge holders  13  on the flow channel unit  114  are provided on the front surfaces of the cartridge holders  13 . 
     Hereinafter, the cartridge holder identifying sections  44  will be described with reference to  FIGS. 14 and 15 . 
     The cartridge holder identifying sections  44  are provided in a left end portion of the rear surface  13   a  of the cartridge holder  13 . A plurality of identifying holder protrusions  44   a  are provided in the cartridge holder identifying sections  44 , and dispositions of the identifying holder protrusions  44   a  are different for each cartridge holder  13 . In  FIGS. 15A to 15F , arrangement examples of the identifying holder protrusions  44   a  are shown with respect to the cartridge holders  13 A,  13 B, . . . ,  13 F. The identifying holder protrusions  44   a  protrude rearward on a base plate  44   b . The base plate  44   b  has a vertically long space in which four identifying holder protrusions  44   a  can be provided. An identification symbol  44   c  for each cartridge holder  13  is disposed in a lower end portion of the base plate  44   b.    
     As shown in  FIG. 15A , in the bottom cartridge holder  13 A, the identifying holder protrusions  44   a  are disposed in a first step and a second step from the top side, and the symbol  44   c  is denoted by “A”. The identification symbol  44   c  is provided so that operating personnel can identify a cartridge holder  13  at first sight since it is difficult to identify any cartridge holder  13  only by considering the dispositions of the identifying holder protrusions  44   a . As shown in  FIG. 15B , in the cartridge holder  13 B in the second step from the bottom side, the identifying holder protrusions  44   a  are disposed in the second step and a third step and the identification symbol  44   c  is denoted by “B”. Hereinafter, similarly, the identifying holder protrusions  44   a  are provided in the cartridge holder  13 C to the cartridge holder  13 F in different disposition patterns. 
     Since the different cartridge holders  13 A to  13 F can be formed in the same die by excluding the cartridge holder identifying sections  44  at the time of molding the cartridge holders  13 A to  13 F, the dispositions of the identifying holder protrusions  44   a  of the cartridge holder identifying sections  44  and a die component in a part corresponding to the identification symbol  44   c  are changeable, whereby a common die can be used as the die molding for all the cartridge holders. Accordingly, it is possible to reduce a manufacturing cost of the cartridge holder  13 . 
     Cartridges storing inks of colors to be mounted are determined for the cartridge holders  13 A to  13 F. Therefore, the cartridge holders  13 A to  13 F and the ink cartridges  12  have improper insertion prevention structure for allowing only ink cartridges  12  of predetermined colors to be mounted for each of cartridge holders  13 A to  13 F. 
     Locking means is provided in the cartridge holders  13 , which locks the cartridge holders  13  to each other at the time of laminating the plurality of cartridge holders  13 . The locking means is described in detail below. 
     As shown in  FIGS. 11A and 12A , locking means  46  locking the cartridge holders by vertically overlapping the cartridge holders  13  with each other is provided in top and bottom parts in front of both right and left side walls  13   b  of each cartridge holder  13 . The cartridge holders  13  are slidable in an attachment direction of the cartridge holders  13  and in the opposite direction with respect to the cartridge holders  13  vertically adjacent each other by the locking means  46 . Therefore, it is possible to individually remove the cartridge holders  13  without removing the cartridge holders  13  vertically adjacent each other by drawing out the cartridge holders  13  in a removal direction opposite to an attachment direction thereof. 
     For example, as shown in  FIG. 11A , locking claws  46   a  (first engaging portions) as the locking means  46  protruding toward both right and left outsides as shown in  FIG. 11B  are provided in upper end portions in front of both right and left side walls  13   b . As shown in  FIG. 12B , receiving pieces  46   b  (second engaging portions) formed in an L shape for engaging with the locking claws  46   a  protrude downward in both right and left end portions in front of a bottom surface  13   c  of the cartridge holder  13 . 
     Protrusions  46   c  are provided in the attachment directions of the cartridge holders  13   c  in opposition with insides (right and left insides) which are open sides of the receiving pieces  46   b . Accordingly, movements of the locking claws  46   a  of the adjacent lower cartridge holders in right and left directions can be prevented by collaboration of the protrusions  46   c  and the receiving pieces  46   b  when the cartridge holders  13  are vertically laminated, and a difficulty in taking the ink cartridges  12  in and out can be prevented by inward fall-down of the side walls  13   b  of the cartridge holders  13  accompanied by the movements of the locking claws  46   a  in the right and left directions. The inward fall-down of the side walls  13   b  may occur at the time of manufacturing the cartridge holders  13  by injection molding. 
     As shown in  FIG. 11A , notches  49  having a size in which the receiving pieces  46   b  and the protrusions  46   c  can pass in a direction perpendicular to the attachment direction (that is, right and left directions) are provided in the vicinity of the front side of the attachment direction from the locking claws  46   a  in the upper end portions of the side walls  13   b  of the cartridge holders  13 . 
     Next, a attaching the cartridge holders  13  will be described. 
     As shown in  FIG. 8 , the plurality of cartridge holders  13  are laminated in a predetermined order, and the cartridge holders  13  are connected to each other. The operating personnel mounts the cartridge holders  13  so that the identification symbols  44   c  represent A, B, C, D, E, and F sequentially from the bottom while confirming the identification symbols  44   c  indicated in the cartridge holder identifying sections  44  of the cartridge holders  13 . Next, the operating personnel abut the flow channel unit  114  on the rear surfaces (right surfaces in  FIG. 8 ) of the cartridge holders  13 . Since the identifying holder protrusions  44   a  of the cartridge holders  13  and flow channel protrusions  59   a  of the flow channel unit  114  interfere with each other when an attaching sequence of the cartridge holders  13  is wrong, the operating personnel cannot fasten screws  64   a  on the cartridge holders  13 . As a result, the operating personnel can confirm attaching states between the cartridge holders  13  with the naked eye. When the cartridge holders  13  are correctly connected to each other, the operating personnel abut the flow channel unit  114  on the cartridge holders  13 . First, the operating personnel pass one screw  64   a  through a screw hole  55   a  of the flow channel unit  114  with respect to each cartridge holder  13  and tightly fasten the one screw  64   a  on a screw hole  47   a  (see  FIG. 14 ) of the cartridge holder  13 . 
     After the flow channel unit  114  is mounted on all cartridge holders  13 , a front surface of the frame  110  abuts on a rear surface of the flow channel unit  114 , two screws  64   b  pass through two screw holes  65   b  of the frame  110  and through screw holes  55   b  of the flow channel unit  114 , and the two screws  64   b  are tightly fastened on the screw holes  47   b  of each cartridge holder  13 . At this time, a head of the screw  64   a  protrudes toward the rear surface of the flow channel unit  114 , but by making sizes of screw holes  65   a  (see  FIG. 7 ) of the frame  110  larger than that of the head of the screw  64   a , interference can be evaded, and the screws  64   a  can be fastened and removed even after the frame  110  is attached. 
     In the above-mentioned attaching process, although the flow channel unit  114  is mounted on the cartridge holders  13  after the plurality of cartridge holders  13  are laminated and connected to each other, the cartridge holders  13  may be mounted on the flow channel unit  114  in a different sequence one by one. 
     As described above, in accordance with the liquid ejecting apparatus provided with the cartridge holders of the exemplary embodiment, identifying protruding portions having the identifying holder protrusions  44   a  and the flow channel protrusions  59   a  having a structure in which a plurality of protrusions are combined are provided on opposed surfaces of the cartridge holders  13  and the flow channel unit  114  opposed to each other so that the cartridge holder  13  and a predetermined attaching position thereof correspond to each other one to one. Therefore, the identifying holder protrusions  44   a  of the cartridge holder  13  and the flow channel protrusions  59   a  of the flow channel unit  114  interfere with each other when attaching the cartridge holders  13  to positions other than predetermined positions of the flow channel unit  114 , whereby it is difficult to attach the cartridge holders  13 . Accordingly, it is possible to prevent the cartridge holders  13  from being mounted in improper positions of the flow channel unit  114 . Accordingly, inks of correct colors are supplied to the nozzle of the inkjet head  62  from the flow channel unit  114 , and printing using correct colors. 
     Since the different cartridge holders  13 A to  13 F can be formed in the same die by excluding the cartridge holder identifying sections  44  protruding toward a surface opposite the flow channel unit  114  at the time of molding the cartridge holders  13 A to  13 F, the dispositions of the identifying holder protrusions  44   a  of the cartridge holder identifying sections  44  and a die component in a part corresponding to the identification symbol  44   c  are changeable, whereby a common die can be used as the die molding the whole cartridge holders. In particular, a structure in which the protrusions are combined is applied to a configuration of the identifying protruding portion, whereby it is easy to change the die component for forming the protrusion. Accordingly, it is possible to reduce the manufacturing cost of the cartridge holder  13  and thus, a manufacturing cost of the publisher  1 , to which the liquid ejecting apparatus of the exemplary embodiment is applied, is reduced. 
     The liquid ejecting apparatus provided with the cartridge holders described herein is not limited to the above-mentioned exemplary embodiment. The liquid ejecting apparatus may include modifications or improvements. 
     For example, in the above-mentioned exemplary embodiment, two identifying holder protrusion  44   a  of the cartridge holder  13  and two flow channel protrusions  59   a  of the flow channel unit  114  are provided, but the number of protrusions is not limited to two. 
     A case in which protrusions are provided as the cartridge holder identifying portions  44  of the cartridge holder  13  and the flow channel identifying portions  59  of the flow channel unit  114  is described, but the protrusion may be used as one identification portion, and concave portions in which the protrusions fit may be used as the other identification portion. 
     Next, removal of the cartridge holder  13 A attached at the middle position will be described with reference to  FIGS. 8 ,  13 A, and  13 B. 
     In the attachment state, each of cartridge holders  13  is fixed to the flow channel unit  114  by the screw  64   a , and each cartridge holder  13  in which the flow channel unit  114  is inserted is fixed to the frame  110  by the screw  64   b . Therefore, first, the cartridge holder  13 B is removed from the flow channel unit  114  and is drawn out to the front side by removing the screws  64   a  and  64   b  of the cartridge holder  13 B (an arrow A of  FIG. 13A ). At this time, the cartridge holder  13 B is drawn out until the locking claws  46   a  of the cartridge holder  13 A are displaced from the receiving pieces  46   b  provided on the bottom surface  13   c  of the upper cartridge holder  13 C, and the receiving pieces  46   b  of the cartridge holder  13 A are displaced from the locking claws  46   a  of the lower cartridge holder  13 A. When the notches  49  of the cartridge holder  13 B reach the receiving pieces  46   b  of the upper cartridge holder  13 C, the cartridge holder  13 A moves in a direction perpendicular to the removing direction, for example, in a right direction as shown in  FIG. 13B  (an arrow B of  FIG. 13B ). Since the receiving pieces  46   b  and the protrusions  46   c  of the upper cartridge holder  13  can pass through the notches  49 , the cartridge holder  13 B can be removed transversely. 
     An arbitrary cartridge holder  13  slides slightly in the removing direction when the plurality of cartridge holders  13  are locked to each other and is moved in a transverse direction by the notches  49 , whereby even the middle cartridge holder  13 A adjacent both the upper and lower different cartridge holders  13  can be easily taken out individually. Shapes of the side walls  13   b  are designed so that the cartridge holders  13  do not interfere with each other in the overall attachment direction length assuming that the amount of slide required for removal extends throughout the overall attachment direction length of the cartridge holders  13 . In accordance with the configuration in which the notches  49  are provided, sliding in the attachment direction is limited, and thus, design flexibility of the cartridge holders  13  is improved. 
     As described above, in accordance with the liquid ejecting apparatus provided with the cartridge holders of the exemplary embodiment, since each of the cartridge holders  13  is slidably locked with the flow channel unit  114  in the attachment direction of the cartridge holders  13  and in the opposite direction by guiding of the locking means  46 , the middle cartridge holder  13 A adjacent the upper and lower different cartridge holders  13  can be individually removed by drawing out the cartridge holders  13  in the direction opposite to the attachment direction. At this time, for example, the cartridge holders  13  adjacent the upper side can be locked by the locking claws  46   a , and the receiving pieces  46   b  can be locked by the locking claws  46   a  of the cartridge holders  13  adjacent the lower side. 
     Since the notches  49  where the receiving pieces  46   b  can pass in the direction perpendicular to the removing direction are provided in the vicinity of the front side of the attachment direction in the upper end portions of the side walls  13   b  of the cartridge holders  13 , the middle cartridge holder  13 A adjacent the upper and lower other cartridge holders  13  can be individually taken out by slightly sliding the cartridge holder  13 A in the removing direction from a locking state and moving the cartridge holder  13 A in the direction perpendicular to the removing direction. Accordingly, since a complicated procedure of removing all the cartridge holders from the flow channel unit and disassembling all the cartridge holders into individual cartridge holders in the related art is not required at the time of removing the middle cartridge holder, workability is improved. 
     As described above, in the liquid ejecting apparatus of the exemplary embodiment, even though the cartridge holders  13  are required to be removed during use of the cartridge holders  13 , an arbitrary cartridge holder  13  can be removed from the flow channel unit  114 , whereby maintenance is made easier. Since all the cartridge holders  13  are not required to be disassembled into the individual cartridge holders  13 , the number of attachments or detachments between the cartridge holders  13  and the cartridge holders  13  or the flow channel unit  114  can be decreased, thereby reducing wear of the components such as the cartridge holders  13  and the flow channel unit  114 . Accordingly, since reliability of attaching the cartridge holders  13  on the flow channel unit  114  can be maintained, ink supply of high reliability from the ink supplying mechanism  71  can be maintained and thus, a high printing quality can be maintained. 
     The liquid ejecting apparatus provided with the cartridge holders described herein is not limited to the above-mentioned exemplary embodiment. The liquid ejecting apparatus may include further modifications or improvements. 
     For example, in the above-mentioned exemplary embodiment, the cartridge holder  13 A is removed by drawing out the cartridge holder  13 A in the removing direction and moving he cartridge holder  13 A in the direction perpendicular to the removing direction. The cartridge holders  13  may be taken out by completely drawing out the cartridge holders in the removing direction by providing the receiving pieces  46   b  throughout the overall lengths of the cartridge holders  13 . 
     In the above-mentioned exemplary embodiment, a case in which the locking claws  46   a  as the locking means  46  which do not protrude toward the upper side in upper portions of the side walls of the cartridge holders  13  and the receiving pieces  46   b  protruding toward the lower side is provided on the bottom surfaces  13   c  of the cartridge holders  13  is described, but the locking claws  46   a  may protrude toward the upper side, and the receiving pieces  46   b  may not protrude toward the lower side. Additionally, the locking claws may protrude from a lower side surface, and the receiving portion thereof may be provided on an upper side surface. In this case, a space portion such as a notch having a depth larger than a protrusion height may be formed so that the protruding portion can pass therethrough in a direction perpendicular to the arranging direction of the cartridge holders 
     The cartridge holders are described by the exemplary embodiment in which an upper side of each cartridge holder is opened, but in this case, one locking claw may be provided in the center of a top plate, and one receiving portion corresponding to the locking claw may be provided in the center of the top plate. The protrusions as the identifying engaging portions are provided on opposed surfaces of the cartridge holder and the flow channel unit are described, but concave portions may be provided on any one of the cartridge holder and the flow channel unit. 
     In addition, although the case in which the cartridge holders  13  are stacked is described in the above-mentioned exemplary embodiment, the cartridge holders  13  may be arranged in a widthwise direction. 
     In the above-mentioned exemplary embodiment, the liquid ejecting apparatus is not limited to the label printer  11  performing printing on the label surface of disk-like media such as the CDs and the DVDs is applied to the publisher  1  processing the media, but the liquid ejecting apparatus may be a printer performing printing on sheet-shaped recording media such as paper or a complex machine having a facsimile function or a copy function, or a testing apparatus discharging test liquid to a predetermined location with a cartridge storing the test liquid. 
     The entire disclosure of Japanese Patent Application Nos. 2006-222805 filed on Aug. 17, 2006 and 2006-222806 filed on Aug. 17, 2006 are expressly incorporated by reference herein. 
     While this invention has been described in conjunction with the specific embodiments thereof, it is evident that many alternatives, modifications, and variations will be apparent to those skilled in the art. Accordingly, preferred embodiments of the invention as set forth herein are intended to be illustrative, not limiting. There are changes that may be made without departing from the spirit and scope of the invention.