Abstract:
A medium processing device is provided. A case defines a space. A storage unit is configured to store a medium. A media drive is operable to perform at least one of writing data on the medium and reading data from the medium. A liquid ejecting unit is operable to eject liquid onto a surface of the medium. An air introducing port is configured to introduce air into the space from outside of the space. An air discharging port is configured to discharge the air to the outside from the space. The space includes a first part in which the media drive is disposed, a second part in which the liquid ejecting unit is disposed and a third part in which the storage unit is disposed. The air introducing port is provided in the first part and the air discharging port is provided in the second part. The first part, the second part and the third part are disposed so that the air is introduced into the first part, flows through the third part and is discharged from the second part.

Description:
[0001]    Priority is claimed to Japanese Patent Application No. 2008-021940 filed Jan. 31, 2008, the disclosure of which, including the specification, drawings and claims, is incorporated herein by reference in its entirety. 
       BACKGROUND 
       [0002]    The present invention relates to a medium processing device including a media drive that writes data on media such as CDs or DVDs and/or reads data from the media and a liquid ejecting unit that ejects a liquid onto a label surface of the media. 
         [0003]    In recent years, medium processing device such as a disc duplication device has been used for writing data on media (information recording media) such as plural sheets of blank CDs (Compact Discs) or blank DVDs (Digital Versatile Discs), and medium processing device such as a CD/DVD publisher capable of writing data and performing label printing has been used to prepare and issue media. A known medium processing device includes a media drive that writes data on a medium, a label printer that performs label printing on a label surface of the medium, and a medium transporting mechanism that holds and transports the medium to the media drive or the label printer (for example, see U.S. Pat. No. 5,734,629). 
         [0004]    In order to improve a writing quality of the media drive, an ambient temperature of the media drive has to satisfy an operation guarantee temperature. In order to satisfy the operation guarantee temperature, a method of introducing air into the inside of the medium processing device from the outside to cool the media drive and to prevent the operation guarantee temperature from increasing can be taken into consideration. However, introducing air into the medium processing device from the outside may cause a minute ink mist, which occurrs as the label printer performs printing on the label surface of the medium, to diffuse to the medium processing device. Therefore, a problem occurs in that the medium stackers, the medium received in the medium stackers, and a power unit may be stained by the diffused ink mist. Another problem occurs when the air introduced inside the medium processing device is discharged from a gap in the medium processing device in that a bottom surface or a wall surface in the vicinity of the gap may be stained. 
       SUMMARY 
       [0005]    It is therefore an object of at least one embodiment of the invention to provide a medium processing device capable of restraining an ink mist from diffusing inside and outside, while cooling a media drive to maintain an operation guarantee temperature. 
         [0006]    According to an aspect of at least one embodiment of the invention, there is provided a medium processing device, comprising: a case defining a space; a storage unit configured to store a medium; a media drive operable to perform at least one of writing data on the medium and reading data from the medium; a liquid ejecting unit operable to eject liquid onto a label surface of the medium; an air introducing port configured to introduce air into the space from outside; and an air discharging port configured to discharge the air to the outside from the space, wherein the space includes a first part in which the media drive is disposed, a second part in which the liquid ejecting unit is disposed and a third part in which the storage is disposed; wherein the air introducing port is provided in the first part and the air discharging port is provided in the second part; and wherein the first part, the second part and the third part are disposed so that the air is introduced into the first part, flows through the third part and is discharged from the second part. 
         [0007]    The medium processing may further comprises a fan that is configured to allows the air to flow from the outside into the first part through the air introducing port, wherein the air introducing port is provided with the fan. 
         [0008]    With the above-described configuration, the fan introduces the air from the outside into the first part in order to cool the media drive. The introduced air passes through the third part. And the air is discharged from the second part in which the liquid ejecting unit is disposed to the outside. Accordingly, the mist generated by the liquid ejecting unit does not flow into the third part. Accordingly, it is possible to effectively restrain the mist from diffusing without staining the medium stored in the third part, while cooling the media drive to maintain an operation guarantee temperature. 
         [0009]    The medium processing device may further comprise a filter that is configured to absorb the liquid diffused in the form of a mist, wherein the air discharging port is provided with the filter. 
         [0010]    With the above configuration, the filter provided in the discharging port adsorbs the mist generated by the liquid ejecting unit. Accordingly, it is possible to restrain the mist from diffusing inside and outside, while cooling the media drive to maintain the operation guarantee temperature. 
         [0011]    The medium processing device may further comprise a fan that is configured to allow the air to flow from the second part to the outside through the air discharging port, wherein the air discharging port is provided with the fan. 
         [0012]    With the above configuration, since the air from the third part is forcibly discharged from the second part, a possibility that the mist occurs is further decreased, and it is possible to obtain an advantage of capturing air containing the ink mist by the mist adsorption filter using a stronger air stream. 
         [0013]    The liquid ejecting unit may include an ink-jet printer that is operable to print on the label surface of the medium. The storage unit may include a stacker that is configured to accommodate the medium and is detachably mounted in the third part. Accordingly, the ink mist of the ink-jet printer is not attached to the stacker and thus does not stain the stacker. 
         [0014]    The medium processing device may further comprise a power unit of the medium processing device, wherein the power unit is disposed in the first part. Accordingly, it is possible to prevent deterioration in safety caused due to the attachment of the mist. 
         [0015]    The medium processing device may further comprises a medium transporting mechanism which is operable to transport the medium between the storage unit and a tray of the media drive or a tray of the ink-jet printer, wherein the transporting mechanism is disposed in the third part. 
         [0016]    With the above-described configuration, a stream is generated by allowing the air introduced from the outside by the fan to flow in the media drive, the medium transporting mechanism, and the liquid ejecting unit and discharging the air through the air discharging port. Accordingly, it is possible to restrain the ink mist from diffusing to the medium transporting mechanism and thus prevent the ink mist from being attached to the medium. 
         [0017]    The medium processing device may further comprise: a printing head of the liquid ejecting unit; and an encoder plate which is operable to detect a location of a tray of the liquid ejecting unit; wherein encoder plate is spaced apart from the printing head. 
         [0018]    With the above-described configuration, the attachment of the ink mist to the encoder plate is prevented and thus high location detection precision of the tray is maintained. Accordingly, it is possible to maintain a good quality of liquid ejecting unit. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0019]    The advantages of the present invention will become more apparent by describing in detail preferred exemplary embodiments thereof with reference to the accompanying drawings, wherein: 
           [0020]      FIG. 1  is a perspective view illustrating the outer appearance of a disc publisher (the medium processing device) in a state where each unit is closed; 
           [0021]      FIG. 2  is a perspective view illustrating the outer appearance of the disc publisher in  FIG. 1  in a state where each unit is opened; 
           [0022]      FIG. 3  is a perspective view illustrating the disc publisher viewed from an upper front side in a state where a case of the disc publisher is removed; 
           [0023]      FIG. 4  is a perspective view illustrating a label printer installed in the disc publisher; 
           [0024]      FIG. 5  is a perspective view when the publisher is viewed from a rear side; 
           [0025]      FIG. 6  is a sectional view illustrating the disc publisher taken along the line VI-VI of  FIG. 5 ; 
           [0026]      FIG. 7  is a plan view illustrating a portion in which the media drives are installed in view of an upper side in  FIG. 6 ; 
           [0027]      FIG. 8  is a perspective view illustrating the label printer installed in the disc publisher in  FIG. 1 ; 
           [0028]      FIG. 9  is a schematic plan view illustrating a belt driving mechanism in  FIG. 8 ; and 
           [0029]      FIG. 10  is a schematic diagram illustrating air stream in the disc publisher in  FIG. 1 . 
       
    
    
     DETAILED DESCRIPTION OF THE EMBODIMENTS 
       [0030]    Hereinafter, a medium processing device will be described with reference to the drawings according to an exemplary embodiment of the invention. 
         [0031]    In particular, a disc publisher that is an example of the medium processing device will be described according to the embodiment. 
         [0032]      FIG. 1  is a perspective view illustrating the outer appearance of the publisher (the medium processing device) in a state where each unit is closed.  FIG. 2  is a perspective view illustrating the outer appearance of the publisher in a state where each unit is opened.  FIG. 3  is a perspective view illustrating the publisher viewed from an upper front side in a state where a case of the publisher is removed.  FIG. 4  is a perspective view illustrating a label printer installed in the publisher. 
         [0033]    As shown in  FIG. 1 , a disc publisher  1  is a medium processing device that writes data on circular disc-shaped media such as CDs or DVDs, reads data from the media, and prints on a label surface of the medium. The medium processing device includes a substantially rectangular parallelepiped case  2 . Openable door  3  and  4  capable of being opened and closed are attached on a front surface of the case  2 . An operation surface  5  provided with display lights, operation buttons, and the like is formed on an upper left of a front side of the case  2 . In a lower portion of the case  2 , leg portions  6  protruding downward are provided on right and left sides. A drawing mechanism  7  is provided between the right and left leg portions  6 . 
         [0034]    As shown in  FIG. 2 , the openable door  3 , which is disposed on the right side on a front side of the medium processing device, opens and closes and provides an opening  8  on the front side of the disc publisher  1 . The openable door  3  is a door is opened when unprocessed (blank) media M are set through the opening  8  or processed medium M are taken out through the opening  8 , for example. 
         [0035]    In addition, the openable door  4 , which is disposed on the left side on the front side of the medium processing device, is opened when ink cartridges  12  of a label printer  11  shown in  FIG. 3  are replaced. When the openable door  4  is opened, a cartridge mounting unit  14  having plural cartridge holders  13  arranged in a vertical direction is exposed. 
         [0036]    Inside the case  2  of the disc publisher  1 , a medium stacker  21  as a storage unit capable of stacking plural sheets (for example, 50 sheets) of unprocessed media M and a medium stacker  22  as a medium storage unit capable of stacking plural sheets (for example, 50 sheets) of unprocessed media M or processed media M are disposed vertically so that a central axis line of the stored media M are the same. The medium stacker  21  and the medium stacker  22  are detachably mounted at predetermined locations, respectively. 
         [0037]    The upper medium stacker  21 , which includes a pair of right and left arc frame plates  24  and  25 , and receives the media M from an upper side and concentrically stacks the media M. A process of stacking media M in the medium stacker  21  can be simply carried out by opening the openable door  3  and taking out the medium stacker  21 . 
         [0038]    The lower medium stacker  22  has the same structure as that of the upper medium stacker  21 . That is, the lower medium stacker  22  also includes a pair of right and left arc frame plates  27  and  28 , and receives the media M from an upper side and concentrically stacks the media M. 
         [0039]    A medium transporting mechanism  31  is disposed on a rear side of the medium stackers  21  and  22 . The medium transporting mechanism  31  includes a vertical guide shaft  35  extending vertically between a main body frame  30  and a top plate  33  of a chassis  32 . A transport arm  36  is supported by the vertical guide shaft  35  so as to ascend, descend, and rotate. The transport arm  36  is capable of ascending and descending along the vertical guide shaft  35  by the drive of a driving motor  37  and capable of rotating right and left on the vertical guide shaft  35 . 
         [0040]    On a side portion of a rear of the upper medium stacker  21 , the lower medium stacker  22 , and the medium transporting mechanism  31 , two media drives  41  stacked vertically are disposed. In addition, a carriage  62  (see  FIG. 4 ) of the label printer  11 , which is described below, is movably disposed on a lower side of the media drives  41 . 
         [0041]    The media drives  41  are each provided with a medium tray  41   a  that moves between a position where data are written on a medium M and a position where the medium M is granted when the medium M are granted and received. 
         [0042]    The label printer  11  includes a medium tray  45  capable of moving between a printing location where label printing on a label surface of the medium M is performed and the location where the medium M is granted when the medium M are granted and received. 
         [0043]      FIG. 3  shows that the medium trays  41   a  of the upper and lower media drives  41  are drawn forward to be positioned at the location where the medium is granted and received and the medium tray  45  of the lower label printer  11  is positioned at the location where the medium is granted and received. In addition, the label printer  11  is an ink-jet printer and uses the ink cartridges  12  of respective colors (six colors of black, cyan, magenta, yellow, light cyan, and light magenta in this embodiment) as an ink supply mechanism  60 . The ink cartridges  12  are mounted from a front side on respective cartridge holders  13  of the cartridge mounting unit  14 . 
         [0044]    Here, spaces where the transport arm  36  of the medium transporting mechanism  31  ascends and descends are formed between the pair of right and left frame plates  24  and  25  of the medium stacker  21  and between the pair of right and left frame plates  27  and  28  of the medium stacker  22 . In addition, a space where the transport arm  36  of the medium transporting mechanism  31  rotates horizontally and is positioned directly above the medium stacker  22  is formed between the upper medium stacker  21  and the lower medium stacker  22 . In addition, when both the medium trays  41   a  enter the media drives  41 , the transport arm  36  of the medium transporting mechanism  31  descends to gain access to the medium tray  45  positioned at the location where the medium is received. 
         [0045]    The transport arm  36  of the medium transporting mechanism  31  is capable of descending lower than the height location of the medium tray  45  in a state where both the medium trays  41   a  are positioned at the location where data are written and the medium tray  45  is positioned at an inward printing position. In addition, below the position of the medium tray  45  where the medium is granted and received, a guide hole  65  (see  FIG. 2 ) in which a medium stacker (separate stacker) described below is formed as a guide for passing the medium M, which the transport arm  36  descends to the position releases. 
         [0046]    The drawing mechanism  7  includes a drawing tray  70  capable of drawing and opening the medium from the main body frame  30  or receiving and closing the medium in a lower portion of the main body frame  30 . In the drawing tray  70 , a stacker unit  71  is formed downward in a concave shape. When the drawing tray  70  is positioned at a receiving location (close location), the stacker unit  71  is positioned below the guide hole  65  and the center of the stacker unit  71  is positioned so that central axis lines of both the medium tray  41   a  and the medium tray  45  at the location where the medium is granted and received are the same. The stacker unit  71  receives the medium M inserted through the guide hole  65  and holds a small number (for example, 5 sheets to 10 sheets) of the medium M. The stacker unit  71  receives the medium M from the upper side to concentrically stack the medium M. 
         [0047]    In the stacker unit  71  of the drawing tray  70  in a received state and the guide hole  65 , a medium stacker (separate stacker)  72  capable of receiving more medium M than the stacker unit  71  is detachably mounted (see  FIG. 3 ). The medium stacker  72 , which also includes a pair of arc frame plates  73  and  74 , receives the medium M from the upper side and holds plural sheets (for example, 50 sheets) of medium so as to concentrically stack the medium. A space where the transport arm  36  of the medium transporting mechanism  31  ascends and descends is formed between one pair of the arc frame sheets  73  and  74 . In addition, a grip  75  allowing a user to attach and detach the medium stacker  71  is provided above the frame plate  74 . 
         [0048]    When the medium stacker  72  is attached, the unprocessed media M are taken out from the lower medium stacker  22  to allow the media drive  41  and the label printer  11  to perform data recording and printing, and the media M are received in the medium stacker  72 . 
         [0049]    For example, the maximum number (50 sheets+50 sheets) of the unprocessed media M are loaded in the upper medium stacker  21  and the lower medium stacker  22 , and all the sheets (50 sheets) of the media M loaded in the lower medium stacker  22  are processed in succession and received in the medium stacker  72 . Next, all the sheets (50 sheets) of the media M loaded in the upper medium stacker  21  are processed in succession and received in the vacant lower medium stacker  22 . In this way, the maximum number (50 sheets+50 sheets) of the media M loaded in the upper medium stacker  21  and the lower medium stacker  22  are processed at one time (batch processing mode). 
         [0050]    When the medium stacker  72  is separated, the unprocessed media M are taken out from the upper medium stacker  21  or the lower medium stacker  22  to allow the media drive  41  and the label printer  11  to perform data recording and printing, and the media M are received in the stacker unit  71  of the drawing tray  70  in the received state. 
         [0051]    Thereafter, by drawing the drawing tray  70 , the processed media M are taken out from the stacker unit  71 . That is, even while the media M are processed, one sheet or plural sheets of the processed medium M can be sequentially taken out from the stacker unit  71  with the openable door  3  closed (outside discharge mode). 
         [0052]    Here, by combination operations of ascending, descending, right rotation, and left rotation by the transport arm  36  of the medium transporting mechanism  31 , the medium M are appropriately transported among the medium stacker  21 , the medium stacker  22 , the stacker unit  71  (or the medium stacker  72 ) of the drawing tray  70 , the medium tray  41   a  of each media drive  41 , and the medium tray  45  of the label printer  11 . 
         [0053]    As shown in  FIG. 4 , the label printer  11  is provided with the carriage  62  that includes an ink-jet head (print head)  61  with nozzles (not shown) for ink ejection. The carriage  62  reciprocates in a horizontally along a guide shaft (not shown) by a driving force of a carriage motor  68 . 
         [0054]    The label printer  11  is provided with the ink supply mechanism  60  that includes the cartridge mounting unit  14  mounted in which the ink cartridges  12  are. The ink supply mechanism  60 , which have a longitudinal shape, is erected on the main body frame  30  of the publisher  1  to be arranged in the vertical direction. One end of a flexible ink supply tube  63  is connected to the ink supply mechanism  60  and the other end of the ink supply tube  63  is connected to the carriage  62 . 
         [0055]    Ink of each ink cartridge  12  mounted on the ink supply mechanism  60  is supplied to the carriage  62  through the ink supply tube  63 . In addition, the ink is supplied to the ink-jet head  61  through a damper unit and a back-pressure adjusting unit (not shown) provided in the carriage  62  to be ejected from ink nozzles (not shown). 
         [0056]    The ink supply mechanism  60  includes a pressurizing mechanism  64  so that major elements are disposed in the upper portion. Accordingly, the pressurizing mechanism  64  pressurizes the inside of each ink cartridge  12  by sending compressed air to supply the ink stored in an ink pack of each ink cartridge  12 . 
         [0057]    A head maintenance mechanism  81  is provided below a home position (location shown in  FIG. 4 ) of the carriage  62 . 
         [0058]    The head maintenance mechanism  81  includes a head cap  82  which covers the ink nozzles of the ink-jet head  61  exposed to the lower surface of the carriage  62  disposed at the home position; and a used-ink sucking pump  83  which sucks the ink discharged to the head cap  82  by a head cleaning operation or an ink filling operation on the ink-jet head  61 . 
         [0059]    The ink sucked by the used-ink sucking pump  83  of the head maintenance mechanism  81  is sent to a used-ink absorbing tank  85  through a tube  84 . 
         [0060]    In the used-ink sucking tank  85 , an adsorption material is disposed within a case  86  and an upper surface of the used-ink absorbing tank  85  is covered with a cover  88  having plural airing holes  87 . 
         [0061]    In the lower portion of the head maintenance mechanism  81 , a used-ink receiver  89  that is a part of the used-ink absorbing tank  85  is provided so as to receive ink dropped from the head maintenance mechanism  81  and to absorb the dropped ink by the adsorption material. 
         [0062]    As shown in  FIGS. 2 and 3 , the media drives  41  are stacked in a limited space within the disc publisher  1 , so that a gap between the media drives  41  that are easily heated may particularly have a high temperature. In addition, in order to maintain a good writing quality in the media drives  41 , an ambient temperature of the media drives  41  is required to satisfy an operation guarantee temperature. Accordingly, according to this embodiment, the disc publisher  1  is provided with a cooling mechanism that introduces air from the outside into the gap between the media drives  41  in order to effectively cool the media drives  41 . 
         [0063]    As shown in  FIG. 5 , a cooling mechanism  50  that cools the inside of the case  2  by introducing air from the outside is provided on a rear surface panel  2   a  detachably mounted on the rear surface of the case  2 . In the upper portion of the rear surface panel  2   a,  notched holes (air introduction ports)  51   a  and  51   b  are formed right and left to allow outside air to flow into the inside of the case  2  from the rear side of the disc publisher  1 . As shown in  FIGS. 6 and 7 , fans  52  and  53  and hoods  54  and  55  are attached to the inside surface of the rear surface panel  2   a  at the locations of the notched holes  51   a  and  51   b.  The fans  52  and  53  and the hoods  54  and  55  may be integrally formed, or frames having the fans  52  and  53  are attached to the rear surface panel  2   a  and the hoods  54  and  55  may be attached inside the frames, respectively. 
         [0064]    Filters  56  and filter cases  56   a  and  56   b  are interchangeably attached to the outside surface of the rear surface panel  2   a  at the locations of the notched holes  51   a  and  51   b,  that is, an upstream side for introducing the outside air by the fans  52  and  53 . Therefore, upon introducing the outside air into the inside of the case  2 , dusts or the likes of the outside air are captured. With such a configuration, dusts or the like are prevented from entering the inside of the disc publisher  1 . Accordingly, by preventing dusts from being deposited to the media M, it is possible to prevent deterioration of a data writing quality or a label-surface printing quality. Moreover, by preventing lenses used to write data by the media drives  41  from getting dirty from dust deposition, it is possible to maintain a good writing quality. In addition, by appropriately replacing the filters  56 , it is possible to maintain an optimal cooling performance. 
         [0065]    As shown in  FIGS. 5 and 6 , a discharge port  57  for discharging the air inside the case  2  to the rear side of the disc publisher  1  is provided below the rear-surface panel  2   a.  The discharge port  57  is provided below the rear-surface panel  2   a  so as to include a notched hole  58  for discharging the air inside the case  2  to the rear side of the disc publisher  1 , a mist adsorption filer  59  interchageably attached to cover the notched hole  58  mainly by a fabric, and a filter case  59   a  of the mist adsorption filer  59 , so that ink mist or the like is captured by the mist adsorption filer  59  upon discharging the air to the outside of the case. 
         [0066]    On the left side of the cooling mechanism  50 , the power unit  42  provided inside the case  2  in  FIG. 7  is detachably mounted on the outside surface of the rear surface panel  2   a,  and a power connection member  44 , which is shown in  FIG. 5 , connected to a external power source is provided on a cover  43  of the power unit  42 . In addition, a small notched hole for discharging the inside air is formed on the cover  43 . 
         [0067]    Inside the case,  2 , as shown in  FIG. 6 , a rear upper space (first part) S 1  and a rear lower space (second part) S 2  are divided by a partition plate  34   a  that extends in horizontal direction of a frame  34  having an L shape in across section inside the case  2 . The rear upper space S 1  and the rear lower space S 2  are in communication with each other through a front space (third part) S 3 , as shown in  FIG. 6 , where the medium stackers  21  and  22  and the medium transporting mechanism  31  shown in  FIG. 3  are disposed. In the front space S 3  close to the rear upper space S 1 , the fans  52  and  53  are provided in the opposite rear portion of the case. In addition, in the front space S 3  close to the rear lower space S 2 , the discharge port  57  is provided in the opposite rear portion of the case. According to this embodiment, there are provided the notched holes (air introduction ports)  51   a  and  51   b  for allowing air across the rear surface of the case  2  from the outside and the air discharge port  57  for allowing the air to flow to the inside the case  2 . It is preferable that the notched holes and the discharge port are spaced from a wall surface on which the disc publisher  1  is installed. It is also preferable that the power connection member  44  is mounted on the side spaced from the wall surface since the power connection member  44  can be used as an attachment space of a power cord (which is illustrated) to be inserted to the power connection member  44  protruding from the disc publisher  1 . 
         [0068]    In the rear upper space S 1  divided by the frame  34  having the L shape in across section, as shown in  FIG. 7 , the media drives  41  are provided in the center of the medium processing device, the power unit  42  is provided on the left side of the medium processing device, and a board unit  46  is provided on the right side of the medium processing device. In the rear lower space S 2 , as shown in  FIG. 6 , a label printer  11  is provided. That is, the carriage  62  having the ink-jet head  61  of the label printer  11  shown in  FIG. 4  is disposed in the rear lower space S 2  to reciprocate in the rear lower space S 2 . 
         [0069]    The stacked media drives  41  are surrounded by a media drive frame  47  shown in  FIG. 6  so as to be attached to the upper surface of the partition plate  34   a  of the frame  34  with the media drive frame  47  interposed therebetween. On a side plate  47   a  of the media drive frame  47 , notched holes  47   e  are formed in correspondence to the height of the gap between the media drives  41 . 
         [0070]    The fans  52  and  53  are disposed in the rear upper space S 1 , as described above, so that the central height location of the fans  52  and  53  accords with the height location of the gap between the stacked media drives  41 . With such a configuration, the air introduced by the fans  52  and  53  is actively directed to flow toward the gap between the media drives  41 . 
         [0071]    Some of the air flowing toward the gap between the media drives  41  also cools the power unit  42  by flowing some of the air toward the power unit  42  through the notched holes  47   e,  as indicated by an arrow in  FIG. 7 , and discharging some of the air from a notched hole of the cover  43  to the outside. The air passing through the media drives  41  flows through the front space S 3 . 
         [0072]    In the rear lower space S 2  where the discharge port  57  is disposed, the label printer  11  is provided, as shown in  FIG. 6 . 
         [0073]    As shown in  FIG. 8 , a nozzle surface of the ink-jet head  61  mounted on the carriage  62  is oriented downward. The medium tray  45  reciprocates horizontally in the front and rear directions below the ink-jet head  61 . The right end of the medium tray  45  is supported by a guide shaft  302  extending horizontally in the front and rear directions, and the left end thereof is slidably supported by a guide rail  303  extending horizontally in the front and rear directions. 
         [0074]    A driving mechanism of the medium tray  45  includes a timing belt  304  suspended horizontally in the front and rear directions and a tray motor  305  driving the timing belt  304 . The medium tray  45  includes in the upper surface of the rectangular plate a circular low convex portion  45   a  that comes in contact with the circumferential cross-face of the medium to regulate the movement of the medium. 
         [0075]    Next, a belt driving mechanism moving the medium tray  45  will be described. 
         [0076]    In the medium tray  45  moved by the belt driving mechanism  310 , a guide shaft  311  extending horizontally in the front and rear directions of the medium processing device is perforated through a slide bearing  311  formed on one side, and a slide piece  313  formed on the other side is slidably placed in a guide rail  303  extending horizontally in the front and rear directions of the medium processing device. With such a configuration, the medium tray  45  is supported to be slidable in the front and rear directions of the medium processing device by the guide shaft  302  and the guide rail  303 . 
         [0077]    The guide shaft  302  is disposed at a distance along a frame  315  in the front and rear directions of the medium processing device, so that both the ends of the guide shaft  302  are fixed to fixing plates  316 , which are formed on the two ends of the frame  315 . 
         [0078]    On the frame  315 , a driving pulley  321  is rotatably provided in the vicinity of the end on the rear side of the medium processing device and a driven pulley  322  is rotatably provided in the vicinity of the end on the front side of the medium processing device. The timing belt  304  is suspended on the driving pulley  321  and the driven pulley  322 . One side of the medium tray  45  is firmly fixed to the timing belt  304  by a belt clamp  324 . With such a configuration, the medium tray  45  is slid by the drive of the timing belt  304  in a drive direction. 
         [0079]    An encoder plate  332  and a delivery pulley  333  are fixed to a rotational shaft  331  of the driving pulley  321 . The tray motor  305  is provided below the frame  315  and a rotational pulley  336  is provided in a driving shaft  335  of the tray motor  305 . A delivery belt  327  is suspended on the delivery pulley  333  and the rotational pulley  336 . 
         [0080]    On the encoder plate  332 , plural location detecting slits are formed at the same interval along the circumference of the encoder plate  332 , so that a location detector (not shown) detects the location detecting slits of the encoder plate  332 . In addition, the location of the medium tray  45  is detected on the basis of a detection signal from the location detector. 
         [0081]    In the belt driving mechanism  310 , the tray motor  305  is driven to rotate the driving shaft  335 , when driving current having a current value calculated on the basis of PID control as control means is output. Then, a rotational force of the driving shaft  335  is delivered to the rotational shaft  331  of the driving pulley  321  by the delivery belt  327  suspended on the rotational pulley  336  and the delivery pulley  333 , so that the driving pulley  321  rotates. 
         [0082]    In this way, when the driving pulley  321  rotates, the timing belt  304  suspended on the driving pulley  321  and the driven pulley  322  travels, so that the medium tray  45  firmly fixed to the timing belt  304  is moved in the front and rear directions of the medium processing device. 
         [0083]    Here, the ink-jet head  61  mounted on the carriage  62  shown in  FIG. 8  is disposed in the rear lower space S 2 . As shown in  FIG. 9 , the isolation plate  338  for isolating the encoder plate  332  from the rear lower space S 2  is provided between the encoder plate  332  and the frame  315 . 
         [0084]    As indicated by the arrows shown in  FIGS. 6 and 10 , the fans  52  and  53  provided in the notched holes  51   a  and  51   b  opened to the rear upper space S 1  suck air from the outside and allow the air in the case  2 . Then, the air is first introduced to the rear upper space S 1  divided by the partition plate  34   a.    
         [0085]    The introduced air passes through the media drives  41  disposed in the rear upper space S 1  to cool the media drives  41  by removing heat from the media drives  41 , and the air is delivered to the front space S 3  in which the medium stackers  21  and  22  and the medium transporting mechanism  31  show in  FIG. 3  are disposed. 
         [0086]    Some of the air passes through the power unit  42  from the notched holes  47   e  shown in  FIG. 6 , as indicated by the arrows in  FIG. 7 , to cool the power unit  42  by removing heat from the power unit  42  and discharge the air. Thereafter, as shown in  FIG. 10 , the air in the front space S 3  passes through the ink-jet head  61  of the label printer  11  disposed in the rear lower space S 2 , and then is discharged from the discharge port  57 . At this time, the air passing through the ink-jet head  61  contains an ink mist, but the mist adsorption filter  59  provided in the discharge port  57  captures the ink mist. 
         [0087]    In the disc publisher (medium processing device)  1  according to this embodiment, the ink mist occurring in the label printer  11  is not diffused into the front space S 3  in order to actively cool the media drives  41 , which are easily heated to turn into a high temperature. The air introduced from the outside by the fans  52  and  53 , where the media drives  41  are disposed, is discharged from the discharge port  57  provided in the partition, where the label printer  11  is disposed, through the front space S 3  where the medium stackers  21  and  22  and the medium transporting mechanism  31  are disposed. Accordingly, a problem does not occur in that the detachable medium stackers  21 ,  22 , and  72  disposed in the front space S 3  and the medium received in the medium stackers before printing, and the medium transporting mechanism  31  are not stained. In particular, the advantage of not staining the medium stacker  72  positioned at a location where the problem with the staining easily occurs is that the quality of the disc publisher  1  is not degraded. 
         [0088]    Moreover, the mist adsorption filter  59  provided in the discharge port  57  adsorbs the ink mist occurring in the label printer  11 . With such a configuration, it is possible to effectively restrain the ink mist from diffusing inside and outside, while cooling the media drives  41  to maintain the operation guarantee temperature. 
         [0089]    Since the partition plate  34   a  is provided between the label printer  11  and the media drives  41  and the power unit  42 , the air introduced from the outside by the fans  52  and  53  flows into the rear upper space S 1  where the media drives  41  and the power unit  42 , the front space S 3  where the medium transporting mechanism  31 , and the rear lower space S 2  where the label printer  11  is disposed, so that an air stream to the discharge port  57  is generated. 
         [0090]    With such a configuration, it is possible to effectively restrain the ink mist from diffusing inside and outside, while cooling the media drives  41  to maintain the operation guarantee temperature. Moreover, it is possible to restrain the ink mist from diffusing to the power unit  42  and the medium transporting mechanism  31 . 
         [0091]    Since the partition plate  338  is provided for isolating the encoder plate  332  from the rear lower space S 2  where the ink-jet head  61  is disposed, it is possible to restrain the ink mist from being deposited to the encoder plate  332  and maintain high detection precision of the medium tray  45 . 
         [0092]    An additional fan may be provided for discharging air by force. Accordingly, since the air in the front space S 3  can be discharged from the discharge port  57 , a possibility that the ink mist occurring in the label printer  11  diffuses to the front space S 3  is further decreased, and the elements disposed in the front space S 3  or the medium transporting mechanism  31  are not stained. Moreover, it is possible to obtain an advantage of capturing air containing the ink mist by the mist adsorption filter  59  using a stronger air stream. To flow the air within the case  2 , the fan may be disposed at any positions on an air flow path from the air introduction ports  51   a,    51   b  to the discharge port  57 . Only one fan may be provided in the air flow path. Further, means for flowing the air within the case  2  is not limited to the fan. 
         [0093]    The medium is not limited to the disc-shaped medium such as the medium M described in the embodiment, but may be applied to medium having a polygonal shape such as a rectangular shape or an elliptic shape, or any other shape. Moreover, the recording method is not limited to an optical recoding method or a magneto-optical recoding method. 
         [0094]    In the above embodiment, the media drive is a component of the medium processing device whose performance is sensitive to particle deposition caused by dust or other particle sources inside the medium processing device. Also, the ink-jet printer is a component of the medium processing device whose normal operation provides a particle source that affects the performance of other components of medium processing device. The present invention is not limited to a media drive as the component sensitive to deposition of particles or to a ink-jet printer as the component that deposits particles. 
         [0095]    Moreover, the ink-jet printer performing printing on the label surface of the medium is used as an example of an ink-jet device, but the invention is not limited thereto. The invention may be applied to ejection devices in which a mist occurs at ejection time.