Patent Publication Number: US-2023158821-A1

Title: Transport device, liquid ejecting device

Description:
The present application is based on, and claims priority from JP Application Serial Number 2021-188434, filed Nov. 19, 2021, the disclosure of which is hereby incorporated by reference herein in its entirety. 
     BACKGROUND 
     1. Technical Field 
     The present disclosure relates to a transport device and a liquid ejecting device. 
     2. Related Art 
     In the past, as described in JP 2014-136625, a recording device has been known that includes a transport unit having a transporting belt for transporting an object to be transported, a recording unit for causing ink to be ejected onto the object to be transported, and a belt cleaning device for cleaning the transporting belt. 
     However, in the recording device described in JP 2014-136625 A, there is a problem that abnormality of the belt cleaning device cannot be appropriately detected. 
     SUMMARY 
     A transport device includes a transporting belt capable of transporting a medium, a cleaning unit capable of cleaning the transporting belt with liquid, and a sound collecting unit configured to collect a sound generated by operation of the cleaning unit. 
     A liquid ejecting device includes an ejecting unit capable of ejecting a liquid droplet onto a medium, a transporting belt capable of transporting the medium, a cleaning unit capable of cleaning the transporting belt with liquid, and a sound collecting unit configured to collect a sound generated by operation of the cleaning unit. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    is a schematic view illustrating a configuration of a liquid ejecting device. 
         FIG.  2    is a schematic view illustrating a disposition example of sound collecting units. 
         FIG.  3    is a block diagram illustrating a control configuration of the liquid ejecting device. 
         FIG.  4    is a flowchart illustrating a control method of the liquid ejecting device. 
         FIG.  5    is a schematic view illustrating another disposition example of the sound collecting units. 
         FIG.  6    is a schematic view illustrating a yet another disposition example of the sound collecting units. 
         FIG.  7    is a schematic view illustrating a still another disposition example of the sound collecting units. 
         FIG.  8    is a schematic view illustrating a further another disposition example of the sound collecting units. 
         FIG.  9    is a schematic view illustrating a still further another disposition example of the sound collecting units. 
     
    
    
     DESCRIPTION OF EXEMPLARY EMBODIMENTS 
     1. First Embodiment 
     First, a configuration of a liquid ejecting device  100  will be described. The liquid ejecting device  100  of the present embodiment is an ink jet-type textile printer that forms an image or the like on a medium M. 
     As illustrated in  FIG.  1    and  FIG.  2   , the liquid ejecting device  100  includes a transport device  110  and an ejecting unit  40 . The transport device  110  includes a medium transporting unit  20 , a cleaning unit  50 , and the like. Furthermore, the liquid ejecting device  100  includes a medium fitting part  60 , a drying unit  27 , and the like. The liquid ejecting device  100  includes a control unit  1  that controls each of the above units and the like. Each unit of the liquid ejecting device  100  and the like are attached to a frame portion  90 . 
     The medium transporting unit  20  is configured to transport the medium M. The medium transporting unit  20  includes a medium supplying unit  10 , a transporting roller  22 , a transporting belt  23 , a rotating roller  24 , a driving roller  25 , transporting rollers  26 ,  28 , and a medium collecting part  30 . 
     Note that in the present embodiment, each unit of the liquid ejecting device  100  will be described using an XYZ coordinate system in which an X-axis, a Y-axis, and a Z-axis are orthogonal to each other. A direction along the X-axis is defined as an X direction, a direction along the Y-axis as a Y direction, and a direction along the Z-axis as a Z direction. Further, a tip side of an arrow indicating a direction is defined as a + direction, and a base end side of the arrow indicating the direction is defined as a - direction. A direction in which gravity acts on the liquid ejecting device  100  is defined as a -Z direction, a direction along a direction in which the medium M is transported in the ejecting unit  40  is defined as the X direction, and a width direction of the medium M intersecting both the Z direction and the X direction is defined as the Y direction. Additionally, a positional relationship along a transport direction of the medium M or a movement direction of the transporting belt  23  is also referred to as “upstream side” or “downstream side”. 
     The medium supplying unit  10  is configured to supply the medium M onto which an image is formed to the ejecting unit  40  side. For example, fabric such as cotton, wool, polyester, or the like is used as the medium M. The medium supplying unit  10  includes a feeding shaft part  11  and a bearing part  12 . The feeding shaft part  11  is formed in a cylindrical shape or a columnar shape, and is provided rotatably in a circumferential direction. The medium M having a band shape is wound around the feeding shaft part  11  to form a roll shape. The feeding shaft part  11  is detachably attached to the bearing part  12 . This allows the medium M being wound beforehand onto the feeding shaft part  11  to be attached to the bearing part  12  together with the feeding shaft part  11 . 
     The bearing part  12  rotatably supports both ends in an axis direction of the feeding shaft part  11 . The medium supplying unit  10  includes a rotation driver (not illustrated) configured to rotate and drive the feeding shaft part  11 . The rotation driver rotates the feeding shaft part  11  in a direction in which the medium M is supplied. An operation of the rotation driver is controlled by the control unit  1 . The transporting roller  22  relays the medium M from the medium supplying unit  10  to the transporting belt  23 . 
     The transporting belt  23 , which is held between at least two rollers for rotating the transporting belt  23 , transports the medium M toward the transport direction (+X direction) with rotation and movement of the transporting belt  23 . More specifically, the transporting belt  23 , which is endlessly formed with the both end portions of a band-shaped belt being coupled to each other, is hung between two rollers of the rotating roller  24  and the driving roller  25 . The transporting belt  23  is retained, with a predefined tension being acting, such that a portion between the rotating roller  24  and the driving roller  25  is held horizontal. A surface (support face)  23   a  of the transporting belt  23  is provided with an adhesive layer  29  onto which the medium M adheres. The transporting belt  23  supports (holds) the medium M supplied from the transporting roller  22  and fitted onto the adhesive layer  29  by the medium fitting part  60 . 
     The rotating roller  24  and the driving roller  25  support a back surface  23   b  (an inner circumferential surface) of the transporting belt  23 . Note that a configuration may be employed in which between the rotating roller  24  and the driving roller  25  is provided a support portion such as a roller for supporting the transporting belt  23 . 
     Power is transmitted to the driving roller  25  directly or indirectly from a motor (not illustrated) configured to rotate and drive the driving roller  25 . The driving roller  25  is provided downstream the ejecting unit  40  with respect to the transport direction of the medium M, while the rotating roller  24  is provided upstream the ejecting unit  40 . When the driving roller  25  is rotated and driven, the transporting belt  23  rotates in association with the rotation of the driving roller  25 , and the rotating roller  24  rotates in association with the rotation of the transporting belt  23 . In association with the rotation of the transporting belt  23 , the medium M supported by the transporting belt  23  is transported in the transporting direction, and an image is formed on the medium M by the ejecting unit  40 . 
     In the present embodiment, the medium M is supported on a side (+Z direction side) where the surface  23   a  of the transporting belt  23  faces the ejecting unit  40 , and the medium M is transported together with the transporting belt  23  from the rotating roller  24  side to the driving roller  25  side. While on the side where the surface  23   a  of the transporting belt  23  faces the cleaning unit  50  (-Z direction side), the transporting belt  23  alone is moved from the driving roller  25  side to the rotating roller  24  side. Note that description is made above on the transporting belt  23  including the adhesive layer  29  onto which the medium M is fitted, but the transporting belt  23  is not limited to this. For example, the transporting belt  23  may be of an electrostatic attraction type belt for attracting the medium M onto the belt with static electricity, or various adsorption force expression mechanisms such as vacuum suction and intermolecular force can be adopted. 
     The transporting roller  26  is configured to remove the medium M on which an image is formed from the adhesive layer  29  of the transporting belt  23 . The transporting rollers  26  and  28  relay the medium M from the transporting belt  23  to the medium collecting part  30 . 
     The medium collecting part  30  is configured to collect the medium M transported by the medium transporting unit  20 . The medium collecting part  30  includes a winding shaft part  31  and a bearing part  32 . The winding shaft part  31  is formed in a cylindrical shape or a columnar shape, and is provided rotatably in a circumferential direction. Around the winding shaft part  31 , the medium M in a band-like shape is wound in a roll-like shape. The winding shaft part  31  is detachably attached to the bearing part  32 . Thus, the medium M wound onto the winding shaft part  31  can be detached together with the winding shaft part  31 . 
     The bearing part  32  rotatably supports both ends in an axis direction of the winding shaft part  31 . The medium collecting part  30  includes a rotation driver (not illustrated) configured to rotate and drive the winding shaft part  31 . The rotation driver rotates the winding shaft part  31  in a direction in which the medium M is wound. An operation of the rotation driver is controlled by the control unit  1 . 
     The cleaning unit  50  is configured to clean the transporting belt  23  with a cleaning liquid as liquid. The cleaning unit  50  is disposed below the transporting belt  23 , and between the rotating roller  24  and the driving roller  25  in the X direction. The cleaning unit  50  includes a cleaning section  51 , an adjustment unit  52 , and a moving section  53 . The moving section  53  causes the cleaning unit  50  to be integrally moved in parallel with a floor surface  99  and then to be fixed at a predefined position. 
     The cleaning section  51  contacts the transporting belt  23  to clean the transporting belt  23 . The cleaning section  51  cleans the surface  23   a  of the transporting belt  23  moving toward the rotating roller  24  from the driving roller  25  from below (the -Z direction). 
     The cleaning section  51  includes a storage tank  54 , a rotary brush  58 , and a wiper unit  55 . 
     The storage tank  54  is a tank configured to store a cleaning liquid used to clean ink and foreign materials adhering onto the surface  23   a  of the transporting belt  23 . The rotary brush  58  and the wiper unit  55  are provided inside the storage tank  54 . As the cleaning liquid, for example, water or a watersoluble solvent (alcoholic aqueous solution or the like) may be used, and to which a surfactant agent and an antifoaming agent may be added as necessary. 
     The rotary brush  58  extends in the Y direction and is configured to be rotatable about a shaft. The rotary brush  58  is partially immersed in the cleaning liquid stored in the storage tank  54 , and cleans the transporting belt  23  while rotating. Specifically, as the rotary brush  58  is rotated, the cleaning liquid is supplied onto the surface  23   a  of the transporting belt  23  and the rotary brush  58  and the transporting belt  23  slide each other. Thus, ink adhering onto the transporting belt  23 , fiber of the medium M, and the like are removed by the rotary brush  58 . 
     The wiper unit  55  includes at least one wiper blade  55   a  capable of wiping the cleaning liquid adhering to the transporting belt  23  by contacting the transporting belt  23 . The wiper blade  55   a  is a plate member extending in the Y direction. The wiper blade  55   a  is formed of a flexible material such as silicon rubber. The wiper blade  55   a  is provided downstream the rotary brush  58  in the transport direction of the transporting belt  23 . The transporting belt  23  and the wiper blade  55   a  slide against each other and thus, the cleaning liquid remaining on the surface  23   a  of the transporting belt  23  is removed. Note that, in the present embodiment, the two wiper blades  55   a  are provided, and the two wiper blades  55   a  are disposed at predetermined intervals in the X direction. Also, the two wiper blades  55   a  are disposed in a state of being inclined with respect to the X direction. 
     Further, the cleaning section  51  includes a blower unit  59 . The blower unit  59  blows compressed air from an opening  59   a  toward the surface  23   a  of the transporting belt  23  ( FIG.  2   ). In the present embodiment, a plurality of the openings  59   a  are disposed in the Y direction. The blower unit  59  is provided downstream the wiper blade  55   a  in the transport direction of the transporting belt  23 . By blowing the compressed air toward the surface  23   a  of the transporting belt  23 , the surface  23   a  of the transporting belt  23  can be dried. 
     The adjustment unit  52  is configured to be able to adjust a load exerted by the cleaning section  51  on the transporting belt  23 , when the cleaning section  51  (the wiper blade  55   a  and the rotary brush  58 ) comes into contact with the transporting belt  23 . The adjustment unit  52  of the present embodiment is a raising/lowering device constituted by an air cylinder  56  and a ball bushing  57 , and supports the cleaning section  51  from below. Along with raising/lowering operation of the adjustment unit  52 , it is possible to adjust a contact pressure with the transporting belt  23  of the cleaning section  51 . Note that, in the present embodiment, the adjustment unit  52  raises or lowers the storage tank  54  together with the cleaning section  51 , but the present disclosure is not limited thereto. For example, the adjustment unit may raise and lower only the cleaning section  51 . Alternatively, the adjustment unit, while raising or lowering the rotary brush  58 , may adjust the contact pressure with to the transporting belt  23  of the cleaning section  51  by changing an inclination of the wiper blade  55   a . 
     Additionally, the transport device  110  of the present embodiment includes at least one sound collecting unit  85  ( FIG.  2   ) described below. 
     Next, the medium fitting part  60 , the ejecting unit  40 , and the drying unit  27  provided along the medium transporting unit  20  will be described. 
     The medium fitting part  60  is configured to fit the medium M onto the transporting belt  23 . The medium fitting part  60  is provided upstream (-X direction side) the ejecting unit  40 . The medium fitting part  60  includes a press roller  61 , a press roller driver  62 , and a roller support part  63 . The press roller  61  is formed in a cylindrical shape or a columnar shape, and is provided rotatably in a circumferential direction. The press roller  61  is rotatable about a shaft, and is disposed to have an axis direction intersecting the transport direction. The roller support part  63  is provided on the back surface  23   b  side of the transporting belt  23  facing the press roller  61  with the transporting belt  23  interposed between the roller support part  63  and the press roller  61 . 
     The press roller driver  62  is configured to press the press roller  61  in the -Z direction side, to move the press roller  61  in the transport direction (+X direction), and a direction opposite to the transport direction (-X direction). The medium M superimposed on the transporting belt  23  is pressed onto the transporting belt  23  between the press roller  61  and the roller support part  63 . This allows the medium M to be reliably affixed to the adhesive layer  29  provided on the surface  23   a  of the transporting belt  23 , and to prevent the medium M from floating up over the transporting belt  23 . 
     The ejecting unit  40  is disposed above (+Z direction side) the transporting belt  23 , and is configured to execute printing (recording) onto the medium M supported on the surface  23   a  of the transporting belt  23 . The ejecting unit  40  includes a head unit  42 , a carriage  43  on which the head unit  42  is installed, a carriage moving unit  45  configured to move the carriage  43  in the width direction (Y direction) of the medium M intersecting the transport direction, and the like. The head unit  42  of the present embodiment includes a plurality of ejecting heads (not illustrated) that eject ink (for example, yellow, cyan, magenta, black, and the like), as liquid droplets, as liquid supplied from an ink supply unit (not illustrated) onto the medium M supported by the transporting belt  23 . 
     The carriage moving unit  45  is provided above (+Z direction side) the transporting belt  23 . The carriage moving unit  45  includes a pair of guide rails  45   a  and  45   b  extending along the Y direction. The head unit  42  is supported by the guide rails  45   a  and  45   b  in a state capable of reciprocating together with the carriage  43  in the Y direction. 
     The carriage moving unit  45  includes a moving mechanism (not illustrated) and a power source (not illustrated). As the moving mechanism, a mechanism including a combination of a ball screw and a ball nut, a linear guide mechanism, or the like may be employed. Further, the carriage moving unit  45  includes a motor (not illustrated) as a power source to move the carriage  43  along the guide rails  45   a  and  45   b . As the motor, any kind of motors such as a stepping motor, a servo motor, and a linear motor can be adopted. When the motor is driven by control of the control unit  1 , the head unit  42  moves together with the carriage  43  in the Y direction. 
     The drying unit  27  is provided between the transporting roller  26  and the transporting roller  28 . The drying unit  27  is configured to dry ink ejected onto the medium M. The drying unit  27  includes, for example, an IR heater, and can drive the IR heater to dry ink ejected onto the medium M for a short period of time. Thus, the medium M having a band shape on which an image and the like are formed can be wound onto the winding shaft part  31 . 
     Next, the sound collecting unit  85  will be described. The sound collecting unit  85  is, for example, a microphone, and collects a sound generated by operation of the cleaning unit  50 . This allows detection of an abnormal sound at the time of malfunction of the cleaning unit  50 . Then, by a detected abnormal sound, occurrence of a cleaning failure of the transporting belt  23  by the cleaning unit  50  can be detected. Furthermore, a loss of image quality on the medium M due to the cleaning failure of the transporting belt  23  can be reduced. Furthermore, by detecting occurrence of a cleaning failure by the cleaning unit  50 , it is easy to adjust and repair the cleaning unit  50 , and a downtime of the liquid ejecting device  100  can be reduced. 
     The sound collecting unit  85  of the present embodiment collects a sound generated from the cleaning section  51 . This makes it possible to detect an abnormal sound caused by deterioration or the like of the cleaning section  51 , and a reduction in cleaning performance for the transporting belt  23  by the cleaning section  51  can be suitably detected. 
     Specifically, as illustrated in  FIG.  2   , the sound collecting unit  85  is disposed at an outer surface  54   a  of the storage tank  54 . The storage tank  54  is a box body that extends in the Y direction and has an opening on an upside and a bottom wall on a downside. That is, the sound collecting unit  85  is disposed on at least one of an end face in the +Y direction and an end face in the -Y direction of the storage tank  54 . This makes it possible to prevent the sound collecting unit  85  from being wet by a cleaning liquid. 
     In addition, in the present embodiment, the two sound collecting units  85  ( 85   a ,  85   b ) are disposed on the end face in the -Y direction of the storage tank  54 . The two sound collecting units  85   a  and  85   b  are disposed side by side in the X direction. Then, the sound collecting unit  85   a  on one side disposed in the +X direction of the two sound collecting units  85   a  and  85   b  is disposed on the end face in the -Y direction of the storage tank  54  in a state overlapping with at least a part of the rotary brush  58 , when viewed from a direction in which the rotary brush  58  extends, that is from the -Y direction. That is, the sound collecting unit  85   a  is disposed facing the rotary brush  58 . This makes it possible to easily detect an abnormal sound caused by deterioration of a tip portion of the rotary brush  58  or the like, and a reduction in cleaning performance for the transporting belt  23  due to deterioration of the rotary brush  58  or the like can be suitably detected. 
     Additionally, the sound collecting unit  85   b  on another side is disposed on the end face in the -Y direction of the storage tank  54  in a state overlapping with at least a part of the wiper unit  55 , when viewed from a direction in which the wiper blade  55   a  extends, that is, from the -Y direction. That is, the sound collecting unit  85   b  is disposed at a position where a sound generated from the wiper blade  55   a  can be efficiently collected. Accordingly, a configuration can be employed in which an abnormal sound caused by wear of the wiper blade  55   a  or the like can be detected, and thus a reduction in cleaning performance for the transporting belt  23  by the wiper blade  55   a  can be suitably detected. Also, a state of tension of the transporting belt  23  can be easily detected from a sound collected from the wiper blade  55   a . 
     Note that, similar to the above, the two sound collecting units  85  ( 85   a ,  85   b ) may also be disposed at the end face in the +Y direction of the storage tank  54 . As a result, an abnormal sound according to the rotary brush  58  or the wiper blade  55   a  can be detected more efficiently. 
     As illustrated in  FIG.  3   , the liquid ejecting device  100  includes an input device  6  in which recording conditions and the like are input, and the control unit  1  that controls each unit of the liquid ejecting device  100 . Examples of the input device  6  include various personal computers, a tablet-type terminal, and a portable-type terminal. Note that, the input device  6  may be provided independently from the liquid ejecting device  100 . 
     The control unit  1  includes an interface unit (I/F)  2 , a Central Processing Unit (CPU)  3 , a storage unit  4 , and a control circuit  5 . The interface unit  2  transmits/receives data between the input device  6  configured to handle input signals or images and the control unit  1 . 
     The CPU  3  is an arithmetic processing unit configured to process input signals from various detector groups  7  including the sound collecting unit  85  and to control recording operation of the liquid ejecting device  100 . For example, the CPU  3  performs operations for performing control of the liquid ejecting device  100  based on sound data input from the sound collecting unit  85 . 
     The storage unit  4 , which serves as a storage medium that ensures an area for storing the programs, a work area, and the like of the CPU  3 , includes a storage device such as a Random Access Memory (RAM), an Electrically Erasable Programmable Read Only Memory (EEPROM), or the like. 
     The control unit  1  controls driving of an ejecting head included in the head unit  42  in accordance with the control signals output from the control circuit  5  to cause ink to be ejected onto the medium M. The control unit  1  controls driving of a motor provided in the carriage moving unit  45  in accordance with the control signals output from the control circuit  5  to cause the carriage  43  at which the head unit  42  is installed to reciprocate in the Y direction, that is in a main scanning direction. The control unit  1  controls driving of a motor provided in the driving roller  25  in accordance with the control signals output from the control circuit  5  to cause the transporting belt  23  to be rotated and moved. As a result, the medium M supported on the transporting belt  23  is moved in the transport direction (+X direction). 
     Images and the like are formed on the medium M by execution of the recording operation (intermittent operation) in which main scanning where the control unit  1  controls the carriage moving unit  45  and the head unit  42  to cause the head unit  42  (carriage  43 ) to be moved while causing the ejecting head to eject ink and sub-scanning where the control unit  1  controls the driving roller  25  to cause the medium M to be transported in the transport direction are alternately repeated. 
     The control unit  1  controls the cleaning section  51  in accordance with the control signals output from the control circuit  5 , causes the rotary brush  58  and the blower unit  59  to drive and to clean the transporting belt  23 . Further, the control unit  1  controls the adjustment unit  52  in accordance with the control signals output from the control circuit  5 , and controls a load exerted by the cleaning section  51  on the transporting belt  23 . 
     Next, a control method of the liquid ejecting device  100  will be described. 
     As illustrated in  FIG.  4   , in step S 11 , sound collecting processing is performed. Specifically, the control unit  1  acquires respective pieces of sound data detected by the sound collecting units  85   a  and  85   b , and calculates an amplitude and frequency based on the respective pieces of sound data. 
     In step S 12 , the control unit  1  determines whether the cleaning section  51  deteriorates or not. That is, the control unit  1  determines whether an operation failure occurs in the cleaning section  51  or not. The deterioration of the cleaning section  51  is associated with the sound data. Specifically, the control unit  1  determines whether the amplitude and frequency based on the sound data of the sound collecting units  85  ( 85   a ,  85   b ) are within respective prescribed value ranges. A prescribed value is an amplitude or frequency when the cleaning section  51  is operating normally. That is, the prescribed value is an amplitude or frequency of a normal sound of the cleaning section  51  (sound when an abnormal sound is not generated). The prescribed values include an amplitude and a frequency of each of the wiper blade  55   a , the rotary brush  58 , and the blower unit  59 . Each prescribed value is collected by the sound collecting unit  85  in advance, and an amplitude and a frequency based on the sound data are stored in the storage unit  4 . 
     Then, when determining that the cleaning section  51  deteriorates (the amplitude or frequency based on the acquired sound data is not within the prescribed value range) (YES), the control unit  1  proceeds to step S 13 , and when determining that the cleaning section  51  does not deteriorate (the amplitude or frequency based on the acquired sound data is within the prescribed value range) (NO), the control unit  1  ends the processing. 
     For example, when, due to wear or deterioration of the rotary brush  58  or the wiper blade  55   a , contact pressure with the transporting belt  23  weakens, a generated sound decreases. In this case, the amplitude decreases compared to the prescribed value. Accordingly, it can be determined that the rotary brush  58  or the wiper blade  55   a  deteriorates. 
     The sound collecting unit  85   a  is disposed near the rotary brush  58  and, in particular, collects a sound generated due to operation of the rotary brush  58 . As a result, the control unit  1  can determine the deterioration or the like of the rotary brush  58 , based on the sound data collected by the sound collecting unit  85   a . Specifically, it is possible to determine deterioration of the tip portion of the rotary brush  58 , abnormality of a drive mechanism of the rotary brush  58 , a water shortage in the storage tank  54 , or a state of generation of foam of the cleaning liquid in the storage tank  54 . 
     Also, the sound collecting unit  85   b  is disposed near the wiper blade  55   a , and, in particular, collects a sound generated by the wiper blade  55   a . Accordingly, the control unit  1  can determine deterioration of the wiper blade  55   a , and the like, based on the sound data collected from the sound collecting unit  85   b . Specifically, deterioration of the wiper blade  55   a , deterioration of the transporting belt  23 , and a situation of deterioration of a state of the surface  23   a  of the transporting belt  23  can be determined. 
     Also, the sound collecting unit  85   b  can also collect a sound generated from the opening  59   a  of the blower unit  59 . Accordingly, the control unit  1  can determine abnormality of the blower unit  59 , based on sound data collected from the sound collecting unit  85   b . Specifically, it is possible to determine presence or absence of, clogging of the opening  59   a  due to foreign matter, or foreign matter suction. 
     Note that in step S 12 , when the cleaning section  51  is determined to deteriorate, warning may be displayed on a display unit of the input device  6 . Also, a warning sound may be generated. Thus, a user can easily recognize that abnormality occurs in operation of the cleaning section  51 . 
     When the processing transits to step S 13 , load adjustment processing is performed. Specifically, the control unit  1  controls the adjustment unit  52  to cause a load exerted by the cleaning section  51  on the transporting belt  23  to be increased. Specifically, the control unit  1  causes the air cylinder  56  to drive and the cleaning section  51  to be raised. As a result, loads of the rotary brush  58  and the wiper blade  55   a  onto the transporting belt  23  are increased, and a reduction in cleaning performance due to deterioration of the cleaning section  51  can be automatically compensated. 
     Note that, in the present embodiment, in step S 12 , the control unit  1  uses the amplitude and frequency of a case where the cleaning section  51  is operating normally as the prescribed values, but the present disclosure is not limited thereto. The control unit  1  may use an amplitude and a frequency of a case where the cleaning section  51  is operating while generating an abnormal sound. In this case, for example, a sound of the case where the cleaning section  51  is operating while generating the abnormal sound is collected in advance, and an amplitude and a frequency based on sound data of the abnormal sound are stored in the storage unit  4 . 
     Further, a configuration may be employed in which the prescribed value is stored in an external server device, rather than in the storage unit  4 . In this case, the prescribed value is acquired by accessing the server device via the interface unit  2  of the control unit  1 . In this manner, it is possible to reduce a load on the storage unit  4 . 
     2. Second Embodiment 
     Next, a second embodiment will be described. In the present embodiment, another disposition example of the sound collecting units  85  will be described. Note that configurations identical to those in the first embodiment will be denoted by the same reference signs and redundant descriptions will be omitted. 
     As illustrated in  FIG.  5   , the wiper unit  55  includes a hollow holding member  55   b  that holds the wiper blade  55   a . In the present embodiment, the holding member  55   b  is disposed for each wiper blade  55   a . 
     The holding member  55   b  extends in the Y direction, and is coupled to an inner surface of the storage tank  54  and is supported. A height of an upper end portion of the holding member  55   b  in the Z direction is approximately the same as a height of an upper end portion of the storage tank  54  in the Z direction. A dimension in the Y direction of the holding member  55   b  is substantially the same as a dimension in the Y direction of the wiper blade  55   a , and the holding member  55   b  supports an entire bottom of the wiper blade  55   a . The holding member  55   b  is made of sheet metal and has a rectangular outer shape when viewed in the +Y direction. 
     Furthermore, the sound collecting unit  85  is accommodated in an interior (hollow region) of the holding member  55   b . A disposition position of the sound collecting unit  85  is not particularly limited, and may be disposed at a center portion in the Y direction of the holding member  55   b , or may be disposed at an end portion. Also, the number of sound collecting units  85  installed is not particularly limited, and may be one, or multiple. 
     As described above, according to the present embodiment, by disposing the holding member  55   b , the sound collecting unit  85  can be disposed at a position closer to the wiper blade  55   a , and an abnormal sound of the wiper blade  55   a  can be easily detected. Furthermore, by the installation of the holding member  55   b , it is possible to suppress application of the cleaning liquid to the sound collecting unit  85 . 
     3. Other Embodiments 
     Hereinafter other disposition examples of the sound collecting units  85  will be described. 
     In the first embodiment, the two sound collecting units  85  are disposed at each of the end face in the +Y direction and the end face in the -Y direction of the storage tank  54 , but the present disclosure is not limited to this configuration. For example, as illustrated in  FIG.  6   , the three sound collecting units  85  may be disposed at each of the end face in the +Y direction and the end face in the -Y direction of the storage tank  54 . 
     In this case, of the three sound collecting units  85  disposed at each of the end face in the +Y direction and the end face in the -Y direction of the storage tank  54 , the sound collecting unit  85  disposed at a position farthest in the +X direction is disposed at a position overlapping with at least a part of the rotary brush  58 , when viewed from a direction in which the rotary brush  58  extends, that is, from the Y direction. Additionally, each of the remaining two sound collecting units  85  is disposed at a position overlapping with at least a part of the wiper unit  55 , when viewed from a direction in which the wiper blade  55   a  extends, that is, from the Y direction. 
     As a result, an abnormal sound according to the rotary brush  58  or each wiper blade  55   a  can be detected efficiently. 
     Also, as illustrated in  FIG.  7   , disposition may be made around a center in the Y direction of each wiper blade  55   a . As a result, it is possible to specialize in collecting a sound generated when each wiper blade  55   a  and the transporting belt  23  come into contact, and an abnormal sound according to each wiper blade  55   a  can be detected more efficiently. 
     Additionally, as illustrated in  FIG.  8   , the sound collecting unit  85  may be disposed at a frame portion  90  disposed adjacent to the cleaning unit  50 . In this case, for example, the sound collecting unit  85  is disposed at a location proximate to the rotary brush  58  or the wiper blade  55   a . Even in this way, an abnormal sound regarding operation of the cleaning unit  50  can be detected. 
     In addition, for example, when it is difficult to dispose the sound collecting unit  85  directly at the cleaning unit  50 , the sound collecting unit  85  may be disposed around the liquid ejecting device  100  as illustrated in  FIG.  9   . Even in this way, an abnormal sound regarding operation of the cleaning unit  50  can be detected. 
     Note that, a configuration may be employed in which the dispositions of the sound collecting units  85  described in the first embodiment, the second embodiment, and the other embodiments described above may be combined as appropriate. 
     In the above-described embodiment, in the liquid ejecting device  100 , a failure of the cleaning unit  50  is detected based on sound data detected by the sound collecting unit  85  disposed in the cleaning unit  50 , but the present disclosure is not limited thereto. In addition to sound data by the sound collecting unit  85 , various types of printing setting information of the liquid ejecting device  100  (for example, ON/OFF information of the IR heater of the drying unit  27 , information of a load exerted by the cleaning section  51  on the transporting belt  23  by the adjustment unit  52 , type information of ink ejected from the head unit  42 , and the like), printing image information (for example, a width dimension of the medium M, transport speed information of the medium M by the medium transporting unit  20 , printing DUTY information, and the like), internal information of the liquid ejecting device  100  (for example, temperature information for each location of the liquid ejecting device  100 , an operation time of the liquid ejecting device  100 , and the like) may be used in combination. Furthermore, information related to the transporting belt  23  (for example, adhesive force information of the adhesive layer  29 , tension information of the transporting belt  23 ) may be employed. This makes it possible to further increase accuracy of detecting a failure of the cleaning unit  50 . 
     Additionally, an acceleration sensor may be used in addition to the sound collecting unit  85 . Accordingly, in addition to sound data, motion information, vibration information, and impact information of each unit can be obtained, and thus accuracy of detecting a failure of the cleaning unit  50  can be increased. 
     In the embodiment described above, the configuration is employed in which the sound collecting unit  85  is fixedly disposed at a predetermined position, but the present disclosure is not limited thereto. The sound collecting unit  85  may be configured to be movable to any position. Further, for example, a configuration may be employed in which a microphone function of a portable mobile terminal (a mobile phone, a smart phone, or the like) is utilized. In this case, the mobile terminal transmits sound data via the interface unit  2  of the control unit  1 . In this way, sound data at a desired position can be easily acquired. Note that, the input device  6  may also serve as the above mobile terminal. 
     In the above-described embodiment, one sound collecting unit  85  of the plurality of sound collecting units  85  is disposed facing the rotary brush  58 , by being fixed to the end face in the Y direction of the storage tank  54  in a state overlapping with at least a part of the rotary brush  58 , when viewed from the direction in which the rotary brush  58  extends. However, the present disclosure is not limited thereto. One sound collecting unit  85  of the plurality of sound collecting units  85  may be disposed at a position in the +Z direction with respect to the rotary brush  58 , for example, and is disposed at a position off from the end face in the Y direction of the storage tank  54 , and an inclination of the sound collecting unit  85  may be appropriately set. At this time, similarly to the above-described embodiment, the number of the one sound collecting units  85  may be two or more. 
     In addition, the other sound collecting unit  85  of the plurality of sound collecting units  85  is disposed facing the wiper unit  55  by being fixed to the end face in the Y direction of the storage tank  54  in a state overlapping with at least a part of the wiper unit  55 , when viewed from the direction in which the wiper blade  55   a  extends. However, the present disclosure is not limited thereto. The other sound collecting unit  85  of the plurality of sound collecting units  85  may be disposed at a position in the +Z direction with respect to the wiper blade  55   a  or the wiper unit  55 , for example, and is disposed at a position off from the end face in the Y direction of the storage tank  54 , and an inclination of the sound collecting unit  85  may be appropriately set. At this time, similarly to the above-described embodiment, the number of the other sound collecting units  85  may be two or more. 
     That is, a position at which at least one sound collecting unit  85  is disposed or a location to which the at least one sound collecting unit  85  is fixed is not particularly limited as long as at least a sound from the cleaning section  51  can be collected. 
     Note that in the above-described embodiment, although the description has been given using, as the example, the configuration of the liquid ejecting device  100  provided with the transport device  110 , the present disclosure is not limited thereto, and a configuration only with the transport device  110  may be employed. That is, the transport device  110  includes the transporting belt  23 , the cleaning unit  50 , and the sound collecting unit  85 . Even with this configuration, similar advantages as described above can be obtained. 
     Contents derived from the Embodiments will be described below. 
     A transport device includes a transporting belt capable of transporting a medium, a cleaning unit capable of cleaning the transporting belt with liquid, and a sound collecting unit configured to collect a sound generated by operation of the cleaning unit. 
     According to this configuration, it is possible to detect an abnormal sound due to malfunction of the cleaning unit, or the like, and occurrence of a cleaning failure of the transporting belt by the cleaning unit can be detected. 
     The cleaning unit of the transport device described above includes a cleaning section capable of cleaning the transporting belt in contact with the transporting belt, and the sound collecting unit may collect a sound generated from the cleaning section. 
     According to this configuration, it is possible to detect an abnormal sound caused by deterioration of the cleaning section, and a reduction in cleaning performance for the transporting belt by the cleaning section can be suitably detected. 
     The cleaning section of the transport device described above is a wiper unit including a wiper blade capable of wiping the liquid adhering to the transporting belt by contacting the transporting belt, and the sound collecting unit may collect a sound generated from the wiper unit. 
     According to this configuration, a configuration can be employed in which an abnormal sound caused by wear of the wiper blade can be detected, and thus a reduction in cleaning performance for the transporting belt due to wear of the wiper blade can be suitably detected. 
     The wiper unit of the above-mentioned transport device may include a hollow holding member for holding the wiper blade, and the sound collecting unit may be accommodated inside the holding member. 
     According to this configuration, the holding member can also be used as a member for suppressing application of liquid to the sound collecting unit. 
     The cleaning unit of the above-described transport device may include a storage tank in which the liquid is stored, and the cleaning section may be a rotary brush partially immersed in the liquid stored in the storage tank, and capable of cleaning the transporting belt while rotating, and the sound collecting unit may be disposed facing the rotary brush. 
     According to this configuration, a configuration can be employed in which an abnormal sound caused by deterioration of a tip portion of the rotary brush can be detected, and thus a reduction in cleaning performance for the transporting belt due to deterioration of the rotary brush can be suitably detected. 
     The transport device described above may include an adjustment unit capable of adjusting a load exerted by the cleaning section on the transporting belt, and a control unit configured to control the adjustment unit, and the control unit, when determining that the cleaning section deteriorates based on a sound collection result of the sound collecting unit, may control the adjustment unit to increase the load. 
     According to this configuration, it is possible to automatically compensate for a reduction in cleaning performance associated with deterioration of the cleaning section. 
     A liquid ejecting device includes an ejecting unit capable of ejecting a liquid droplet onto a medium, a transporting belt capable of transporting the medium, a cleaning unit capable of cleaning the transporting belt with liquid, and a sound collecting unit configured to collect a sound generated by operation of the cleaning unit. 
     According to this configuration, it is possible to detect an abnormal sound due to malfunction of the cleaning unit, or the like, and occurrence of a cleaning failure of the transporting belt by the cleaning unit can be detected.