Patent Publication Number: US-9889665-B2

Title: Liquid discharging device

Description:
CROSS REFERENCE TO RELATED APPLICATION 
     This application claims priority under 35 U.S.C. § 119 from Japanese Patent Application No. 2015-195360, filed on Sep. 30, 2015, the entire subject matter of which is incorporated herein by reference. 
     BACKGROUND 
     Technical Field 
     The following description relates to one or more aspects of a liquid discharging device capable of discharging liquid through nozzles. 
     Related Art 
     A liquid discharging device capable of discharging liquid through nozzles, e.g., a multifunction peripheral (MFP) having an inkjet printer to print an image in ink that is discharged through nozzles at a sheet, is known. The inkjet printer may have an inkjet head with the nozzles, a cap to cover the nozzles, and a pump, which may be connected with a port-switchable device having a switchable member. The switchable member and the pump may be activated by a conveyer motor, which may be provided to rotate conveyer rollers in the inkjet printer. For example, a driving force from the conveyer motor rotating in one direction may be transmitted to the pump, and a driving force from the conveyer motor rotating in an opposite direction may be transmitted to the port-switchable device so that activation of the pump and the port-switchable device may be switched depending on the rotating direction of the conveyer motor. 
     SUMMARY 
     While the conveyer motor to drive the port-switchable device may rotate the conveyer rollers, in order to drive the conveyer rollers, the conveyer motor may be required to provide a certain extent of intensity of torque. Therefore, in order to rotate the conveyer rollers and drive the port-switchable device simultaneously, it may be necessary that the port-switchable device is designed to be drivable by smaller torque. Meanwhile, when ink in the port-switchable device is thickened, and viscosity of the ink increases, the port-switchable device may not be drivable by the smaller torque. In order to increase the torque to the port-switchable device, a reduction rate in gears between the conveyer motor and the port-switchable device may be increased. However, with the increased reduction ratio in the gears, switching motions to switch connections between the cap and the pump may require longer time. 
     Aspects of the present disclosure are advantageous in that a liquid discharging device capable of providing greater driving torque in a switchable device without increasing a size of the motor or increasing a reduction ratio in gears, is provided. 
     According to an aspect of the present disclosure, a liquid discharging device is provided. The liquid discharging device includes a liquid discharging head having a plurality of nozzles and a liquid discharging surface, the plurality of nozzles being formed on the liquid discharging surface; a conveyer configured to convey a medium in a conveying direction, the conveying direction extending at least partly in parallel with the liquid discharging surface; a nozzle cap configured to move between a contacting position to contact the liquid discharging head and a separated position separated from the liquid discharging head, the nozzle cap being configured to cover the plurality of nozzles when contacting the liquid discharging head; a pump; a switcher configured to switch connection and disconnection between the nozzle cap and the pump; a drivable device; a first motor connected to the conveyer, the first motor being configured to transmit a driving force thereof to the conveyer to drive the conveyer; a second motor configured to drive the switcher and the drivable device; a selector configured to switch transmission destinations for a driving force from the second motor between the switcher and the drivable device to selectively transmit the driving force from the second motor to one of the switcher and the drivable device, the selector switching the transmission destinations depending on a rotating direction of the second motor; and a controller configured to control the second motor to rotate in one of a first direction and a second direction opposite from the first direction, the controller manipulating the selector to switch the transmission destination to the switcher to transmit the driving force from the second motor to the switcher by rotating the second motor in the first direction, and the controller manipulating the selector to switch the transmission destination to the drivable device by rotating the second motor in the second direction. 
    
    
     
       BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS 
         FIG. 1  is a schematic cross-sectional view of a printer according to an exemplary embodiment of the present invention. 
         FIG. 2  is a plan view of a printing unit and a maintenance unit in the printer according to the embodiment of the present disclosure. 
         FIG. 3A  is a leftward side view of a cap-lifting device, a switcher valve, and gears in the printer according to the embodiment of the present disclosure.  FIGS. 3B-3C  are illustrative views of the gears in the printer according to the embodiment of the present disclosure. 
         FIG. 4  is a plan view of a slider in the printer according to the embodiment of the present disclosure. 
         FIG. 5  is a cross-sectional view of the switcher valve in the printer according to the embodiment of the present disclosure taken along a line V-V in  FIG. 3 . 
         FIG. 6A  is a leftward side view of the cap-lifting device, the switcher valve, and the gears with a nozzle cap being lowered to a separated position in the printer according to the embodiment of the present disclosure.  FIG. 6B  is a leftward side view of the cap-lifting device, the switcher valve, and the gears with the nozzle cap being uplifted to a contacting position in the printer according to the embodiment of the present disclosure. 
         FIG. 7  is a leftward side view of the cap-lifting device, the switcher valve, and the gears with the switcher valve being driven in the printer according to the embodiment of the present disclosure. 
         FIG. 8  is a leftward side view to illustrate an arrangement of an aspirator pump and gears connected thereto in the printer according to the embodiment of the present disclosure. 
         FIGS. 9A-9E  are illustrative views to show interconnection among a paper-feed (PF) motor, a feeder roller, a PF input gear, and a PF switchable gear in the printer according to the embodiment of the present disclosure, with an auto sheet-feeder (ASF) switchable gear being engaged with an upper feeder gear ( FIG. 9A ); with the ASF switchable gear being engaged with a lower feeder gear ( FIG. 9B ); with the ASF switchable gear being engaged with a tray-feeder gear ( FIG. 9C ); with the PF switchable gear being released from a pump-drivable gear and the ASF switchable gear being engaged with a selector-drivable gear ( FIG. 9D ); and with the PF switchable gear being engaged with the pump-drivable gear and the ASF gear being engaged with the selector-drivable gear ( FIG. 9E ). 
         FIGS. 10A-10E  are illustrative views to show interconnection among an ASF motor, an ASF input gear, and the ASF switchable gear, and connection with the upper feeder gear, the lower feeder gear, the tray-feeder gear, and the selector-drivable gear established through the ASF switchable gear in the printer according to the embodiment of the present disclosure, with the ASF switchable gear being engaged with the upper feeder gear ( FIG. 10A ); with the ASF switchable gear being engaged with the lower feeder gear ( FIG. 10B ); with the ASF switchable gear being engaged with the tray-feeder gear ( FIG. 10C ); with the ASF switchable gear being engaged with the selector-drivable gear ( FIG. 10D ); and with the ASF gear being engaged with the selector-drivable gear ( FIG. 10E ). 
         FIG. 11  is a block diagram to illustrate transmission paths from a PF motor in the printer according to the embodiment of the present disclosure. 
         FIG. 12  is a block diagram to illustrate transmission paths from the ASF motor in the printer according to the embodiment of the present disclosure. 
         FIG. 13  is a block diagram to illustrate an electrical configuration in the printer according to the embodiment of the present disclosure. 
         FIG. 14  is a flowchart to illustrate a flow of steps in a printing operation to be conducted by a controller in the printer according to the embodiment of the present disclosure. 
         FIGS. 15A-15F  are illustrative views to show communication among the nozzle cap, the switcher valve, and the aspirator pump in the inkjet printer according to the embodiment of the present disclosure, with the nozzle cap, the switcher valve, and the aspirator pump being in a standby state ( FIG. 15A ); in a valve-cleaning action ( FIG. 15B ); in an aspiration-purging action for black ( FIG. 15C ); in an aspiration-purging action for colors ( FIG. 15D ); in an idle-purging action for black ( FIG. 15E ); and in an idle-purging action for colors ( FIG. 15F ). 
         FIG. 16  is a flowchart to illustrate a flow of steps in a maintenance operation to be conducted by the controller in the printer according to the embodiment of the present disclosure. 
         FIG. 17  is a modified example of a printer in a cross-sectional view according to another exemplary embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION 
     Hereinafter, embodiments according to one or more aspects of the present disclosure will be described in detail with reference to the accompanying drawings. 
     It is noted that various connections may be set forth between elements in the following description. These connections in general and, unless specified otherwise, may be direct or indirect and that this specification is not intended to be limiting in this respect. Aspects of the disclosure may be implemented in computer software as programs storable on computer readable media including but not limited to a random access memory (RAM), a read-only memory (ROM), a flash memory, an EEPROM, a CD-media, DVD-media, temporary storage, hard disk drives, floppy drives, permanent storage, and the like. 
     [Overall Configuration of Printer] 
     As shown in  FIGS. 1 and 2 , a printer  1  of the present embodiment includes a printing unit  2 , a lower cassette feeder  3 , an upper cassette feeder  4 , a tray feeder  5 , a sheet reversing unit  6 , and a maintenance unit  7 . 
     [Printing Unit] 
     The printing unit  2  includes a carriage  11 , an inkjet head  12 , conveyer rollers  13 ,  14 , and a platen  15 . The carriage  11  is supported by two (2) guide rails  16 , which extend along a scanning direction, to be movable thereon along the scanning direction. The carriage  11  is connected with a carriage motor  156  (see  FIG. 13 ) through a belt and a pulley, which are not shown, to be driven by the carriage motor  156  to reciprocate along the scanning direction. In the following description, one side and an opposite side along the scanning direction are defined as a right-hand side and a left-hand side respectively, as shown in  FIG. 2 . The scanning direction may include a leftward (right-to-left) direction and a rightward (left-to-right) direction. 
     The inkjet head  12  is mounted on the carriage  11 . The inkjet head  12  is configured to discharge ink from a plurality of nozzles  17  formed on an ink discharging surface  12   a , which is a lower surface of the inkjet head  12 , at a discharge-object medium. The ink discharging surface  12   a  spreads in parallel with a conveying direction, which is a direction to convey a recording sheet P and is orthogonal to the scanning direction, and the nozzles  17  are formed on the ink discharging surface  12   a  in lines to form nozzle rows  18  that extend along the conveying direction. In the inkjet head  12 , a plurality of, e.g., four (4), nozzle rows  18  are formed so that inks in four colors, e.g., black, yellow, cyan, and magenta, may be discharged separately from each nozzle row  18 . For example, the nozzles  17  in the rightmost nozzle row  18  may discharge pigmentary black ink, and the nozzles  17  in the nozzle rows  18  from the second, third, and fourth to the right may discharge yellow, cyan, and magenta pigmentary inks, respectively. 
     The conveyer roller  13  is located in an upstream position from the carriage  11 , or the inkjet head  12 , with regard to the conveying direction. The conveyer roller  13  includes a driving roller  13   a  and a driven roller  13   b  disposed in an upper position with respect to the driving roller  13   a . The driving roller  13   a  is connected with a PF motor  101  (see  FIGS. 9A-9E ). When the PF motor  101  rotates in a reverse direction (e.g., counterclockwise), a driving force from the PF motor  101  is transmitted to the driving roller  13   a , and the driving roller  13   a  rotates in, for example, clockwise in  FIG. 1 . Thereby, the recording sheet P nipped between the driving roller  13   a  and the driven roller  13   b  may be conveyed in the conveying direction. Meanwhile, when the PF motor  101  rotates in a normal direction (e.g., clockwise), the driving roller  13   a  rotates in, for example, counterclockwise in  FIG. 1 . 
     The conveyer roller  14  is located in a downstream position from the carriage  11 , or the inkjet head  12 , with regard to the conveying direction. The conveyer roller  14  includes a driving roller  14   a  and a driven roller  14   b  disposed in an upper position with respect to the driving roller  14   a . The driving roller  14   a  is coupled with the driving roller  13   a  through multiple gears, which are not shown. Thereby, when the driving force from the PF motor  101  is transmitted to the driving roller  13   a , the driving force is further transmitted to the driving roller  14   a  so that the driving roller  14   a  is rotated along with the driving roller  13   a . The conveyer roller  14   a  rotates in the same direction as the conveyer roller  13   a . Accordingly, when the PF motor  101  rotates in the reverse direction, the recording sheet P nipped between the driving roller  14   a  and the driven roller  14   b  may be conveyed in the conveying direction. 
     The platen  15  is arranged in a position between the conveyer roller  13  and the conveyer roller  14  along the conveying direction to face the ink discharging surface  12   a . The platen  15  may support the recording sheet P conveyed by the conveyer rollers  13 ,  14  from below. 
     [Lower Cassette Feeder] 
     The lower cassette feeder  3  is located in a lower position with respect to the platen  15 . The lower cassette feeder  3  includes a sheet cassette  21  and a feeder roller  22 . The sheet cassette  21  may store one or more recording sheets P in a stack. The feeder roller  22  may be connected with an ASF motor  102  (see  FIGS. 10A-10E ) through multiple gears including a lower feeder gear  131  ( FIGS. 9A-9E , solely the lower feeder gear  131  among the multiple gears is shown). While the feeder roller  22  is connected with the ASF motor  102 , and when the ASF motor  102  is activated to rotate in the normal direction, the driving force from the ASF motor  102  is transmitted to the feeder roller  22  so that the feeder roller  22  rotates in the clockwise direction in  FIG. 1 . Accordingly, the recording sheet P stored in the sheet cassette  21  may be conveyed toward a position on an upstream side of the conveyer roller  13  in the conveying direction. In a range between the sheet cassette  21  and the position on the upstream side of the conveyer roller  13 , formed is a feeder path  10 , which may guide the recording sheet P from the sheet cassette  21  to the conveyer roller  13 . Thus, the recording sheet P fed by the feeder roller  22  may be conveyed in the feeder path  10 , in a sheet-flowing direction A 1 , to the position on the upstream side of the conveyer roller  13  with regard to the conveying direction to be fed to the printing unit  2 . 
     [Upper Cassette Feeder] 
     The upper cassette feeder  4  is located in a position between the platen  15  and the lower cassette feeder  3 . The upper cassette feeder  4  includes a sheet cassette  31  and a feeder roller  32 . The sheet cassette  31  is in a configuration similar to the sheet cassette  21  and may store one or more recording sheets P in a stack. The feeder roller  32  may be connected with the ASF motor  102  through multiple gears including an upper feeder gear  132  (see  FIGS. 9A-9E , solely the upper feeder gear  132  among the multiple gears is shown). While the feeder roller  32  is connected with the ASF motor  102 , and when the ASF motor  102  is activated to rotate in the reverse direction, the driving force from the ASF motor  102  is transmitted to the feeder roller  32  so that the feeder roller  32  rotates in the clockwise direction in  FIG. 1 . Accordingly, the recording sheet P stored in the sheet cassette  31  may be fed to the position on the upstream side of the conveyer roller  13  with regard to the conveying direction through the feeder path  10 , in a sheet-flowing direction A 2 , to be fed to the printing unit  2 . 
     [Tray Feeder] 
     The tray feeder  5  is located on the upstream side of the conveyer roller  13  with regard to the conveying direction. The tray feeder  5  includes a feeder tray  41 , a stopper  42 , and a feeder roller  43 . On an upper surface of the feeder tray  41 , one or more recording sheets P may be placed. The recording sheet P on the feeder tray  41  may be conveyed in a sheet-flowing direction A 3  toward the position on the upstream side of the conveyer roller  13 . The feeder tray  41  is formed to have a through hole  41   a  in vicinity of an end of the feeder tray  41  closer to the position on the upstream side of the conveyer roller  13  along the sheet-flowing direction A 3 . Meanwhile, the stopper  42  is arranged to longitudinally extend along the sheet-flowing direction A 3  with a downstream end thereof with regard to the sheet-flowing direction A 3  being arranged to coincide with the through hole  41   a . On a downstream end of the stopper  42  with regard to the sheet-flowing direction A 3 , formed is a projection  42   a , which projects upward. The stopper  42  is attached to a gear  42   b  at an upstream end portion thereof with regard to the sheet-flowing direction A 3 . Therefore, the stopper  42  may swing about an axis of the gear  42   b  along with rotation of the gear  42   b.    
     The feeder roller  43  is located in an upper position with respect to the feeder tray  41 . The feeder roller  43  is attached to an end portion of an arm  44  arranged to longitudinally extend along the sheet-flowing direction A 3 . Specifically, the feeder roller  43  is rotatably supported by a downstream end portion, with regard to the sheet-flowing direction A 3 , of the arm  44 . An upstream end portion of the arm  44  with regard to the sheet-flowing direction A 3  is attached to a gear  44   a . Therefore, the arm  44  may swing about an axis of the gear  44   a  along with rotation of the gear  4   a.    
     The gear  42   b , the feeder roller  43 , and the gear  44   a  are coupled with one another through multiple gears including a tray-feeder gear  133  (see  FIGS. 9A-9E , solely the tray-feeder gear  133  among the multiple gears is shown) and may be connected with the ASF motor  102 . While the gear  42 , the feeder roller  43 , and the gear  44   a  are connected with the ASF motor  102 , and when the ASF motor  102  is activated to rotate in the normal direction, the driving force from the ASF motor  102  is transmitted to the gears  42   b ,  44   a  to rotate the gears  42   a ,  44   a  clockwise in  FIG. 1  so that the feeder roller  43  rotates counterclockwise in  FIG. 1 . On the other hand, when the ASF motor  102  is activated to rotate in the reverse direction, the driving force from the ASF motor  102  is transmitted to the gears  42   b ,  44   a  to rotate the gears  42   b ,  44   a  counterclockwise so that the feeder roller  43  rotates in the clockwise direction in  FIG. 1 . 
     In the tray feeder  5 , when no recording sheet P is to be fed to the printing unit  2 , the stopper  42  is placed in a position indicated by a dash-and-dot line in  FIG. 1 , in which the projection  42   a  protrudes upward through the through hole  41   a . Accordingly, leading ends, or downstream ends with regard to the sheet-flowing direction A 3 , of the recording sheets P stored in the feeder tray  41  may contact the projection  42   a  to be restricted from moving from the tray feeder  5  toward the printing unit  2 . Meanwhile, the arm  44  is placed in a position to have the feeder roller  43  to be separated apart from the recording sheets P in the feeder tray  41 . 
     In contrast, when the recording sheet P is to be fed from the tray feeder  5  to the printing unit  2 , the gear  42   b , the feeder roller  43 , and the gear  44   a  are placed in the condition to be connected with the ASF motor  102 , and the ASF motor  102  is activated to rotate in the normal direction. According to the rotation of the gear  42   b , the stopper  42  may swing clockwise in  FIG. 1 , and, as indicated in solid lines in  FIG. 1 , an upper end portion of the projection  42   a  may be drawn in the through hole  41   a . Thus, the recording sheets P stored in the feeder tray  41  may be released from the restriction by the projection  42   a  and allowed to move in the sheet-flowing direction A 3  toward the printing unit  2 . Meanwhile, the arm  44  may swing clockwise in  FIG. 1  by the rotation of the gear  44   a  and, as indicated by the solid lines in  FIG. 1 , the feeder roller  43  may contact the recording sheet P in the feeder tray  41 . As the feeder roller  43  rotates counterclockwise in  FIG. 1 , the recording sheet P stored in the feeder tray  41  may be conveyed in the sheet-flowing direction A 3  toward the printing unit  2 . When the feeding action to feed the recording sheet P to the printing unit  2  is completed, with the gear  42   a , the feeder roller  43 , and the gear  44   a  being connected with the ASF motor  102 , the ASF motor  102  is rotated in the reverse direction so that the stopper  42  and the arm  44  along with the feeder roller  43  are placed back in the positions indicated by the dash-and-dot lines in  FIG. 1 . 
     [Sheet Reversing Unit] 
     The sheet reversing unit  6  includes, as shown in  FIGS. 1 and 2 , a switchback roller  51  and a plurality of rollers  52 . The switchback roller  51  is located in a position downstream from the conveyer roller  14  with regard to the conveying direction. The switchback roller  51  includes a driving roller  51   a  and a driven roller  51   b  arranged in an upper position with respect to the driving roller  51   a . The driving roller  51   a  is coupled with the driving rollers  13   a ,  14   a  through multiples gears, which are not shown. Therefore, the driving force from the PF motor  101  transmitted to the driving roller  13   a  is further transmitted to the driving roller  51   a  so that the driving roller  51   a  rotates along with the driving roller  13   a . The driving roller  51   a  rotates in the same direction as the driving rollers  13   a ,  14   a.    
     Thus, while the driving roller  13   a  is connected with the ASF motor  102 , and when the PF motor  101  is activated to rotate in the reverse direction, the switchback roller  51  may convey the recording sheet P nipped between the driving roller  51   a  and the driven roller  51   b  in the conveying direction. Meanwhile, while a trailing end, or an end on the upstream side with regard to the conveying direction, of the recording sheet P is in a position on an upstream side of the switchback roller  51  with regard to the conveying direction, the rotating direction of the PF motor  101  may be switched to the normal direction. Thereby, the recording sheet P may be conveyed in a sheet-flowing direction A 4  by the switchback roller  51  to be reversed in a reversing path  53 , which is branched to extend downward from the conveying direction, toward the position on the upstream side of the conveyer roller  13 . 
     The plurality of rollers  52  are located between the platen  15  and the sheet cassette  31  to align in positions closer than the reversing path  53  to the position on the upstream side of the conveyer roller  13  along the sheet-flowing direction A 4 . Each of the rollers  52  includes a driving roller  52   a  and a driven roller  52   b  arranged in an upper position with respect to the driving roller  52   a . The driving roller  52   a  is coupled with the feeder roller  32  through multiple gears, which are not shown. Therefore, the driving force from the ASF motor  102  transmitted to the feeder roller  32  is further transmitted to the driving rollers  52   a  so that the driving rollers  52   a  rotate along with the feeder roller  32 . Thus, when the ASF motor  102  rotates in the normal direction, the driving roller  52   a  may rotate counterclockwise in  FIG. 1 , and the recording sheet P conveyed to the reversing path  53 , nipped between the driving rollers  52   a  and the driven rollers  52   b , may be conveyed in a sheet-flowing direction A 5  toward the feeder path  10  and to the position on the upstream side of the conveyer roller  13  with regard to the conveying direction. Simultaneously, the feeder roller  32  may rotate counterclockwise in  FIG. 1  to convey the recording sheet P together with the rollers  52  toward the feeder path  10  so that the recording sheet P may be inverted upside-down and conveyed to return to the printing unit  2 . 
     [Maintenance Unit] 
     As shown in  FIGS. 2-8 , the maintenance unit  7  includes a wiper  59 , a capping unit  64 , a switcher valve  62 , an aspirator pump  63 , and a waste liquid tank  64 . 
     &lt;Wiper&gt; 
     The wiper  59  is located on one side, e.g., a leftward side, of the platen  15 . The wiper  59  is movable vertically by a wiper-lifting device  157  (see  FIG. 13 ). When the wiper  59  is placed in an upper position by the wiper-lifting device  59 , an upper end of the wiper  59  may be at an equal or higher level than the ink discharging surface  12   a  of the inkjet head  12 . Therefore, when the carriage  11  is moved in a range that coincides with the wiper  59 , the ink discharging surface  12   a  of the inkjet head  12  may contact the wiper  59  in the upper position. Meanwhile, when the wiper  59  is in a lower position, the upper end of the wiper  59  may be at a lower level than the ink discharging surface  12   a . Therefore, when the carriage  11  is moved in the range that coincides with the wiper  59 , the ink discharging surface  12   a  may not contact the wiper  59  in the lower position. 
     &lt;Capping Unit&gt; 
     The capping unit  61  may include two (2) nozzle caps  61   a ,  61   b , which may be integrally formed. The nozzle caps  61   a ,  61   b  are in an arrangement, in which the nozzle cap  61   a  adjoins rightward the nozzle cap  61   b  along the scanning direction. When the carriage  11  is moved to a range, in which the nozzle discharging surface  12   a  faces the capping unit  61 , the rightmost one of the nozzle rows  18  vertically coincides with the nozzle cap  61   a , and the other three (3) nozzle rows  18  on the left vertically coincide with the nozzle cap  61   b . The capping unit  61  is movable vertically by a cap-lifting device  66  between a contacting position (see  FIG. 6B ) and a separated position (see  FIG. 6B ). While the ink discharging surface  12   a  is in the position to face with the capping unit  61 , and when the capping unit  61  is uplifted by the cap-lifting device  66 , the capping unit  61  may be placed to fit closely with or to seal the ink discharging surface  12   a . Therefore, the rightmost nozzle row  18  may be covered with by the nozzle cap  61   a , and the leftward three nozzle rows  18  may be covered with by the nozzle cap  61   b.    
     &lt;Cap-Lifting Device&gt; 
     The cap-lifting device  66  includes, as shown in  FIGS. 3-4 , a cap retainer  71 , a slider  72 , a crank gear  73 , and an arm  74 . The cap retainer  71  includes a cap holder  71   a  and a lifting-lowering member  71 . The cap holder  71   a  supports the capping unit  61  from below to provide rigidity to the capping unit  61 . The lifting member  71  accommodates the cap holder  71   a  and is supported by a guide (not shown) to be vertically movable. The cap retainer  71  further includes a spring  71   c , which is arranged between the cap holder  71   a  and the lifting-lowering member  71 ; thereby, the cap holder  71   a  is urged upward. In each end of a lower surface of the lifting-lowering member  71  along the scanning direction, arranged is a protrusion  71   d , which protrudes downward, and on an outward surface of the protrusion  71   d  with regard to the scanning direction, formed is a projection  71   e , which is formed to extend outward along the scanning direction. 
     The slider  72  includes two (2) parts  76 ,  77 . The part  76  is arranged in a lower position with respect to the lifting-lowering member  71 . On each lateral face of the part  76  along the scanning direction, formed is a groove  76   a , in which the projection  71   e  may be inserted. The groove  76   a  is formed to extend longitudinally in parallel with the conveying direction at each lengthwise end section and to incline in an intermediate section to be higher on an upstream side and lower on a downstream side with regard to the conveying direction. The projection  71   e  is disposed in the groove  76   a  to contact a bottom  76   a   1  of the groove  76   a.    
     The part  77  is formed to be narrower than the part  76  with regard to the scanning direction and extends longitudinally downstream in the conveying direction from a central area in the scanning direction of a downstream end of the part  76 . On a downstream end in the conveying direction of the part  77 , disposed is an arm holder  77   a , which protrudes along the scanning direction to support one end of the arm  74  swingably. On a leftward face  77   b  in the scanning direction of the part  77 , formed is a gear  77   c , which is elongated along the conveying direction. Meanwhile, the slider  72  is provided with an oil damper  78  to mesh with the gear  77   c . The oil damper  78  may prevent the slider  72  from sliding abruptly along the conveying direction. 
     The crank gear  73  is placed in an arrangement such that an axis thereof aligns in parallel with the scanning direction. On a lateral face of the crank gear  73  in a position displaced from a center with regard to the conveying direction, arranged is an arm support  73   a , by which the other end of the arm  74  is rotatably supported. The crank gear  73  is meshed with a bevel gear  129 . 
     &lt;Switcher Valve&gt; 
     The switcher valve  62  includes, as shown in  FIG. 5 , a casing  81  and a flow-channel member  82 . The casing  81  is formed in a shape of a cylindrical dish having a bottom. The casing  81  includes two (2) cap-communication ports  84   a ,  84   b , an air-communication port  84   c , and a pump-communication port  84   d . These ports  84   a - 84   d  are connected with an inner room  81   a  and are formed to protrude outward in different radial directions of the casing  81  from one another. The cap-communication port  84   a  is connected with the nozzle cap  61   a  through a tube  86   a . The cap-communication port  84   b  is connected with the nozzle cap  61   b  through a tube  86   b . The air-communication port  84   c  is connected with the waste liquid tank  64  through a tube  86   c . The pump-communication port  84   d  is connected with the aspirator pump  63  through a tube  86   d.    
     The flow-channel member  82  is made in, for example, rubber and has a cylindrical shape. The flow-channel member  82  is rotatably accommodated in the inner room  81   a  of the casing  81 . The flow-channel member  82  is formed to have grooves (not shown), through which the ports  84   a - 84   d  may be connected to be in fluid communication with one another. The flow-channel member  82  is attached to a valve cam  85  and is connected with a valve-drivable gear assembly  134 , which includes a valve-drivable gear  134   a . The switcher valve  62  to switch connection and disconnection among the ports  84   a - 84   d  may be in a known configuration; therefore, detailed description of the switcher valve  62  is herein omitted. 
     &lt;Selector-Gear System&gt; 
     According to the present embodiment, the driving force from the ASF motor  102  may be selectively transmitted to one of the cap-lifting device  66  and the switcher valve  62  through a selector-gear system  136 . The selector-gear system  136  may switch transmission destinations for the driving force from the ASF motor  102  to transmit the driving force to either the cap-lifting device  66  or the switcher valve  62  depending on a rotating direction of the ASF motor  102 . As shown in  FIG. 3A , the selector-gear system  136  may include a selector-drivable gear  137 , a bevel gear  138 , and a planetary gear system  139 . The selector-drivable gear  137  may be engaged with an ASF switchable gear  122 , which is described later in detail. When engaged with the ASF switchable gear  122 , the selector-drivable gear  137  is connected with the ASF motor  102 . The bevel gear  138  is engaged with the selective gear  137 . The planetary gear system  139  includes a sun gear  139   a  and a planet gear  139   b . The sun gear  139   a  is engaged with the bevel gear  138  and is rotatable along with rotation of the selector-drivable gear  137  and the bevel gear  138 . The planet gear  139   b  is engaged with the sun gear  139   a , and when the sun gear  139   a  rotates, the planet gear  139   b  rotates about an axis thereof and revolves around the sun gear  139   a  about an axis of the sun gear  139   a.    
     While the selector-drivable gear  137  is connected with the ASF motor  102 , when the ASF motor  102  rotates in the normal direction, the driving force from the ASF motor  102  is transmitted to the selector-drivable gear  137 , the bevel gear  138 , the sun gear  139   a , and the planet gear  139   b . Therefore, as shown in  FIGS. 3B and 6A-6B , the sun gear  139   a  rotates counterclockwise in  FIG. 3B , and the planet gear  139   b  revolves about the axis of the sun gear  139   a  clockwise in  FIG. 3B  on a horizontal plane to be engaged with the bevel gear  129 . As the ASF motor  102  continues to rotate in the normal direction, the driving force from the ASF motor  102  is transmitted to the crank gear  73  through the bevel gear  129  to rotate the crank gear  73  counterclockwise in  FIG. 3A ; thereby, the slider  72  is moved to reciprocate along the conveying direction. 
     When the slider  72  moves upstream with regard to the conveying direction, as shown in  FIG. 6A , the projection  71   e  of the lifting-lowering member  71  is guided on the bottom  76   a   1  of the groove  76   a  to the lower-leftward area in the groove  76   a , and the cap retainer  71  and the capping unit  61  are lowered accordingly. On the other hand, when the slider  72  moves downstream with regard to the conveying direction, as shown in  FIG. 6B , the projection  71   e  of the lifting-lowering member  71  is guided on the bottom  76   a   1  of the groove  76   a  to the upper-rightward area in the groove  76   a . Thereby, the cap retainer  71  and the capping unit  61  are uplifted. Meanwhile, the oil damper  78  rotates along with the sliding movement of the slider  72 . Thus, in the cap-lifting device  66 , the rotation of the crank gear  73  in one direction is converted into the sliding reciprocating movement of the slider  72  along the conveying direction, with the projection  71   e  of the lifting-lowering member  71  being guided on the bottom  76   a   1  of the groove  76   a  in the slider  72 , the cap retainer  71  and the capping unit  61  are uplifted. 
     On the other hand, while the selector-drivable gear  137  is connected with the ASF motor  102 , when the ASF motor  102  rotates in the reverse direction, the driving force from the ASF motor  102  is transmitted to the selector-drivable gear  137 , the bevel gear  138 , the sun gear  139   a , and the planet gear  139   b . Therefore, as shown in  FIGS. 3C and 7 , the sun gear  139   a  rotates clockwise in  FIG. 3C , and the planet gear  139   b  revolves about the axis of the sun gear  139   a  counterclockwise in  FIG. 3C  on the horizontal plane to be engaged with the valve-drivable gear  134   a . As the ASF motor  102  continues to rotate in the reverse direction, the driving force from the ASF motor  102  is transmitted to the valve-drivable gear  134   a  and rotate the valve-drivable gear assembly  134  and rotate the valve cam  85  and the flow-channel member  82 . Thus, the flow-channel member  82  rotates in the switcher valve  62  so that connection or disconnection between the cap-communication ports  84   a ,  84   b  and the pump-communication port  84   d  and connection among the communication ports  84   a - 84   d  may be switched. 
     The aspirator pump  63  may be a tubed pump and is connected with the pump-communication port  84   d  of the switcher valve  62  on one side through the tube  86   d  and with the waste liquid tank  64  on a opposite side from the switcher valve  62  through a tube  86   e . As shown in  FIG. 8 , the aspirator pump  63  includes a gear  63   a . The gear  63   a  is connected with a pump-drivable gear assembly  141 , which includes a pump-drivable gear  141   a , and may be connected with the PF motor  101  through the pump-drivable gear  141   a . While the aspirator pump  63  is connected with the PF motor  101 , and when the PF motor  101  rotates in the normal direction, the driving force from the PF motor  101  is transmitted to the aspirator pump  63 , and the aspirator pump  63  is placed in a disconnected condition, in which the tube  86   d  and the tube  86   e  are disconnected from each other. As the PF motor  101  continues to rotate in the normal direction, the aspirator pump  63  may aspirate the fluid. On the other hand, when the PF motor  101  rotates in the reverse direction, the driving force from the PF motor  101  is transmitted to the aspirator pump  63 , and the aspirator pump  63  is placed in a connected condition, in which the tubes  86   d ,  86   e  are connected with each other. The configuration of the aspirator pump  63 , in which connection and disconnection between the tubes may be switched depending on the rotating direction of the motor, is known; therefore, detailed description is herein omitted. 
     The waste liquid tank  64  may store waste liquid, and the like, such as purged ink, which will be described later in detail. A room in the waste liquid tank  64  to contain the waste ink is in fluid communication with the atmosphere. Therefore, the waste liquid tank  64  and the air-communication port  84   c  are in fluid communication through the tube  86   c . When the aspirator pump  63  is in the connected condition, the pump-communication port  84   d  is in fluid communication with the atmosphere through the tubes  86   d ,  86   e , the aspirator pump  63 , and the waste liquid tank  64 . 
     [Connection and Disconnection with Motors] 
     Next, switching the connection and disconnection of the PF motor  101  and the ASF motor  102  will be described with reference to  FIGS. 9A-9E, 10A-10E, 11, and 12 . In  FIGS. 11 and 12 , connection between two or more items illustrated in solid lines indicates that these items are maintained connected at all times, and connection illustrated in broken lines indicates that two of these items are selectively connectable with each other. 
     As shown in  FIGS. 9A-9E and 11 , the PF motor  101  is connected with a driving shaft  105 , and the driving roller  13   a  is attached to the driving shaft  105 . Further, the driving shaft  105  is attached to a PF input gear  111 . When the PF motor  101  rotates, the driving shaft  105 , the driving roller  13   a , and the PF input gear  111  rotate integrally. 
     The PF input gear  111  is engaged with a PF switchable gear  112 . The PF switchable gear  112  is rotatably supported by a shaft  106 , which extends along the scanning direction. The PF switchable gear  112  is movable along the scanning direction on the shaft  106  in conjunction with the reciprocation of the carriage  11  in the scanning direction. Thereby, the PF switchable gear  112  is movable selectively to one of positions illustrated in  FIGS. 9A-9E . While in any of the positions illustrated in  FIGS. 9A-9D , the PF switchable gear  112  is not engaged with the pump-drivable gear  141   a . While in the position illustrated in  FIG. 9E , the PF switchable  112  is engaged with the pump-drivable gear  141   a . Meanwhile, the PF switchable gear  112  is engaged with the PF input gear  111  in any of the positions illustrated in  FIGS. 9A-9E . 
     Meanwhile, as shown in  FIGS. 9A-9E, 10A-10E, and 12 , the ASF motor  102  is connected with the ASF input gear assembly  121 . The ASF input gear assembly  121  includes an ASF input gear  121   a , which is engaged with the ASF switchable gear  122 . The ASF switchable gear  122  is supported rotatably by the shaft  106 . The ASF switchable gear  122  is attached to the shaft  106  in an arrangement such that positional relation between the ASF switchable gear  122  and the PF switchable gear  112  in the scanning direction is maintained at all times. Therefore, when the PSF switchable gear  112  is moved in the scanning direction along with the reciprocation of the carriage  11 , the ASF switchable gear  122  likewise moves in the scanning direction. 
     Thus, the PF and ASF switchable gears  112 ,  122  may be moved in the scanning direction to be selectively in one of the positions illustrated in  FIGS. 9A-9E . The ASF switchable gear  122  is, when in the position illustrated in  FIG. 9A , engaged with the upper feeder gear  132 , and when in the position illustrated in  FIG. 9B , engaged with the lower feeder roller  131 . When in the position illustrated in  FIG. 9C , the ASF switchable gear  122  is engaged with the tray-feeder gear  133 , and when in the positions illustrated in  FIGS. 9D and 9E , the ASF switchable gear  122  is engaged with the selector-drivable gear  137 . 
     [Controller] 
     Next, a controller  150  to control behaviors and actions in the printer  1  will be described. The controller  150  includes, as shown in  FIG. 13 , a central processing unit (CPU)  151 , a read only memory (ROM)  152 , a random access memory (RAM)  153 , an application specific integrated circuit (ASIC)  154 , which in conjunction control the behaviors of the devices in the printer  1  including the carriage motor  156 , the inkjet head  12 , the PF motor  101 , and the ASF motor  102 . 
     While  FIG. 13  shows solely one (1) CPU  151  to process signals or jobs in the controller  150 , the CPU  151  may not necessarily be limited to a single CPU  151  that processes the signals or the jobs alone but may include multiple CPUs  151  that may share loads of the processes. Further, the ASIC  154  in the controller  150  may not necessarily be limited to a single ASIC that processes the signals or the jobs alone but may include multiple ASICs  55  that may share loads of the processes. 
     [Printing Operation] 
     Next, a flow of steps in a printing operation to print an image on the recording sheet P will be described. In the printing operation, the controller  150  may conduct the flow of steps shown in  FIG. 14 . When the printer  1  is in a standby state, in which no printing or maintenance operation is conducted, the capping unit  61  is fitted to the ink discharging surface  12   a  so that the ink in the nozzles  17  may be prevented from the air and from drying. Further, when in the standby state, communication between the cap-communication ports  84   a ,  84   b  and the pump-communication port  84   d  is established in the switcher valve  62  (see  FIG. 15A ). Meanwhile, the aspirator pump  63  is in the connected condition. Therefore, in the standby state, the nozzle caps  61   a ,  61   b  to cover the nozzles  17  are in fluid communication with the atmosphere through the aspirator pump  63 . Further, in the standby state, the PF switchable gear  112  and the ASF switchable gear  122  are in the positions illustrated in  FIG. 9E . In this regard, in  FIG. 15A , a bidirectional arrow in the aspirator pump  63  indicates that the aspirator pump  63  is in the connected condition. 
     As shown in  FIG. 14 , in order to print an image in the printer  1 , in S 101 , the controller  150  manipulates the ASF motor  102  to rotate in the normal direction to lower the capping unit  61 . In S 102 , the controller  150  manipulates one of the sheet cassettes  21 ,  31 , and the feeder tray  41  to feed the recording sheet P to the printing unit  2 . For example, the controller  150  may move the carriage  11  to move the PF switchable gear  112  and the ASF switchable gear  122  to one of the positions illustrated in  FIGS. 9A-9C . If the PF and ASF switchable gears  112 ,  122  are in the positions illustrated in  FIG. 9A , the controller  150  activates the ASF motor  102  to rotate in the reverse direction. If the PF and ASF switchable gears  112 ,  122  are in either of the positions illustrated in  FIGS. 9B and 9C , the controller  150  activates the ASF motor  102  to rotate in the normal direction. 
     In S 103 , the controller  150  determines whether the leading end of the recording sheet P reached the conveyer roller  13 . For example, a sensor to detect the recording sheet P may be set in a position upstream from the conveyer roller  13  in the conveying direction, and the determination in S 103  may be made based on outputs from the sensor. For another example, a distance, in which the recording sheet P is conveyed, may be calculated based on a rotation amount of the feeder roller  22 ,  32 , or  43 , and the determination in S 103  may be made based on the calculation. The controller  150  waits until the leading end of the recording sheet P reaches the conveyer roller  13  (S 103 : NO). When the leading end of the recording sheet P reaches the conveyer roller  13  (S 103 : YES), the flow proceeds to S 104 . If the recording sheet P is fed from either the sheet cassette  21  or the sheet cassette  31  (S 104 : NO), the flow proceeds to S 106 . 
     On the other hand, if the recording sheet P is fed from the sheet tray  41  (S 104 : YES), in S 105 , the controller  150  manipulates the PF motor  101  to rotate in the normal direction for a predetermined length of time (e.g., 1-2 seconds) so that skew of the recording sheet P with respect to the conveying direction may be corrected. For example, the recording sheet P fed from the sheet tray  41  may reach the conveyer roller  13  in a skewed orientation. When the recording sheet P reached the conveyer roller  13  in the skewed orientation, only a part of the leading end of the recording sheet P may be nipped between the driving roller  13   a  and the driven roller  13   b . Therefore, in the present embodiment, the PF motor  101  may be rotated in the normal direction to rotate the driving roller  13   a  in the opposite direction from the direction to convey the recording sheet P in the conveying direction. Thereby, the part of the leading end of the recording sheet P that is nipped between the driving roller  13   a  and the driven roller  13   b , which is on the downstream side of the conveyer roller  13 , is released to the upstream side, and the skew of the recording sheet P may be corrected. 
     Following S 104  or S 105 , in S 106 , the controller  150  conducts a printing action, in which the recording sheet P is conveyed in the conveying direction, the carriage is moved to reciprocate along the scanning direction, and the ink is discharged through the nozzles  17  of the inkjet head  12  at the recording sheet P being conveyed. For example, by rotating the PF motor  101  in the reverse direction, the conveyer rollers  13 ,  14  and the switchback roller  51  may be manipulated to convey the recording sheet P in the conveying direction; by activating the carriage motor  156 , the carriage  11  may be moved to reciprocate along the scanning direction; and by driving the inkjet head  12 , the ink may be discharged through the nozzles  17 . 
     The printing action is continued until the image is printed on the recording sheet P (S 107 : NO). When printing the image on the recording sheet P is completed (S 107 : YES), in  5108 , the controller  150  stops driving the carriage motor  156  and the inkjet head  12 . When no printing is performed on the reversed side of the recording sheet P (S 109 : NO), in S 110 , the controller  150  continues to rotate the PF motor  101  in the reverse direction to eject the recording sheet P outside. In S 110 , the controller  150  places the printer  1  in the standby state and ends the flow. 
     Meanwhile, in S 109 , when printing is to be performed on the reversed side of the recording sheet P (S 109 : YES), in S 112 , the controller  150  determines whether the trailing end of the recording sheet P reached a position on an upstream side of the switchback roller  51 . For example, a sensor to detect the recording sheet P may be set in a position upstream from the switchback  51  in the conveying direction, and the determination in S 112  may be made based on outputs from the sensor. For another example, a distance, in which the recording sheet P is conveyed, may be calculated based on a rotation amount of the feeder roller  22 ,  32 , or the switchback roller  51 , and the determination in S 112  may be made based on the calculation. 
     The controller  150  continues to rotate the PF motor  101  in the reverse direction to convey the recording sheet P until the trailing end of the recording sheet P reaches the position upstream from the switchback roller  51  in the conveying direction (S 112 : NO). When the trailing end of the recording sheet P reaches the position upstream from the switchback roller  51  (S 112 : YES), in S 113 , the controller  150  inverts the recording sheet P and returns the recording sheet P to the printing unit  2 . Specifically, the controller  150  rotates the PF motor  101  in the normal direction to manipulate the switchback roller  51  to convey the recording sheet P to the reversing path  53 . Further, with the PF and ASF switchable gears  112 ,  122  moved to the positions illustrated in  FIG. 9A , the controller  150  manipulates the ASF motor  102  to rotate in the normal direction so that the rollers  52  and the feeder roller  32  may convey the recording sheet P conveyed to the reversing path  53  toward the printing unit  2 . Following S 113 , the flow returns to S 106 . 
     [Maintenance] 
     Next, a flow of steps in a maintenance operation with use of the maintenance unit  7  will be described. In the maintenance operation, the controller  150  may conduct the flow of steps shown in  FIG. 16 . 
     As the flow starts, in S 201 , the controller  150  determines whether the flow-channel member  82  is adhered to the casing  81  and immovable. When the controller  150  determines that the flow-channel member  82  is movable (S 201 : NO), the flow proceeds to S 203 . When the controller  150  determines that the flow-channel member  82  is immovable (S 201 : YES), in S 202 , the controller  150  conducts a valve-cleaning action and proceeds to S 203 . In S 201 , for example, in the standby state, when the ASF motor  102  is rotated in the reverse direction, and when current supplied to the ASF motor  102  exceeds a predetermined threshold value due to the immovability of the flow-channel member  82 , the controller  150  may determine that the flow-channel member  82  is adhered to the casing  81 . 
     In the valve-cleaning action in S 202 , the controller  150  manipulates the PF motor  101  in the standby state to rotate in the normal direction, as shown in  FIG. 15B , so that the aspirator pump  63  is activated. Accordingly, the ink in the inkjet head  12  is ejected through the nozzles  17  to flow in the switcher valve  62 . Thereby, the ink clotted in the switcher valve  62  may absorb the moisture of the ink that flows in the switcher valve  62  and dissolve in the ink so that the adherence of the flow-channel member  82  may be loosened. Further, while the aspirator pump  63  is active, the ASF motor  102  may be rotated in the reverse direction to rotate the flow-channel member  82 . Accordingly, the ink may be delivered evenly and entirely to narrower areas in the switcher valve  62 . Thereby, the adherence of the flow-channel member  82  to the casing  81  may be cleared. In  FIG. 15B  and in  FIGS. 15C-15F , downward arrows indicate that the aspirator pump  63  in the disconnected condition is aspirating the fluid. 
     It may be noted that, when aspiration purging or idle aspiration is conducted, which will be described later, the ink flows into the switcher valve  62 . If the ink is left inside the switcher valve  62  for an extended period of time, the ink may clot, and the flow-channel member  82  may adhere to the casing  81  by the clotted ink. When the flow-channel member  82  adheres to the casing  81 , the flow-channel member  82  may be immobilized in the casing  81  for purging and idle aspiration. When the ink used in the printer  1  is pigmentary ink, which may clot rather easily after being left at the nozzles  17  for a certain length of time, the adherence of the flow-channel member  82  may occur more often. In consideration of this, the valve-cleaning action described above may be conducted so that adherence of the flow-channel member  82  to the casing  81  may be overcome. 
     In S 203 , aspiration-purging is conducted. Specifically, aspiration-purging for black, in which the black ink with increased viscosity may be removed from the inkjet head  12 , and aspiration-purging for colors, in which the colored inks with increased viscosity may be removed from the inkjet head  12 , are conducted continuously. 
     In the aspiration-purging for black, the capping unit  61  is placed to fit to the ink discharging surface  12   a , and the PF and ASF switchable gears  112 ,  122  are placed in the positions illustrated in  FIG. 9E . Further, the controller  150  rotates the ASF motor  102  in the reverse direction to rotate the flow-channel member  82 . Thereby, as shown in  FIG. 15C , the cap-communication port  84   a  and the pump-communication port  84   d  are connected to communicate with each other, and the cap-communication port  84   b  and the air-communication port  84   c  are connected to communicate with each other. In this condition, the controller  150  rotates the PF motor  101  in the normal direction so that the aspirator pump  63  is activated to aspirate the fluid. Thereby, the black ink with the increased viscosity in the inkjet head  12  may be ejected through the nozzles  17  in the rightmost nozzle row  18 . Meanwhile, the cap-communication port  84   b  and the air-communication port  84   c  are maintained in fluid communication so that pressure in the nozzle cap  61   b  may be restrained from increasing when a volume in the nozzle cap  61   b  is reduced due to deformation of the cap unit  61  during the aspiration. 
     In aspiration-purging for colors, the capping unit  61  is placed to fit to the ink discharging surface  12   a , and the PF and ASF switchable gears  112 ,  122  are placed in the positions illustrated in  FIG. 9E . Further, the controller  150  rotates the ASF motor  102  in the reverse direction to rotate the flow-channel member  82 . Thereby, as shown in  FIG. 15D , the cap-communication port  84   b  and the pump-communication port  84   d  are connected to communicate with each other, and the cap-communication port  84   b  and the air-communication port  84   c  are connected to communicate with each other. In this condition, the controller  15  rotates the PF motor  101  in the normal direction so that the aspirator pump  63  is activated to aspirate the fluid. Thereby, the colored inks with the increased viscosity in the inkjet head  12  may be ejected through the nozzles  17  in the three nozzle rows  18  on the left. Meanwhile, the cap-communication port  84   a  and the air-communication port  84   c  are maintained in fluid communication so that pressure in the nozzle cap  61   a  may be restrained from varying when a volume in the nozzle cap  61   a  is reduced due to deformation of the cap unit  61  during the aspiration. 
     In S 204 , the ink remaining in the capping unit  61  after the aspiration-purging action may be ejected in post-purging idle aspiration. Specifically, idle aspiration for black, in which the black ink remaining in the nozzle cap  61   a  after the aspiration-purging action for black is ejected, and idle aspiration for colors, in which the colored inks remaining in the nozzle cap  61   b  after the aspiration-purging action for colors is ejected, are conducted continuously. 
     In the idle-aspiration action for black, the PF and ASF switchable gears  112 ,  122  are placed in the positions illustrated in  FIG. 9E , and the controller rotates the ASF motor  102  in the normal direction so that the crank gear  73  is rotated and the capping unit  61  is lowered, as shown in  FIG. 15E . Thereafter, the controller  150  rotates the ASF motor  102  in the reverse direction to rotate the flow-channel member  82  so that the cap-communication port  84   a  and the pump-communication port  84   d  are connected to communicate with each other. In this condition, the controller  150  rotates the PF motor  101  in the normal direction to activate the aspirator pump  63 . Thereby, the black ink remaining in the nozzle cap  61   a  may be removed. 
     In the idle-aspiration action for colors, the PF and ASF switchable gears  112 ,  122  are placed in the positions illustrated in  FIG. 9E , and the controller  150  rotates ASF motor  102  in the normal direction so that the crank gear  73  is rotated and the capping unit  61  is lowered, as shown in  FIG. 15F . Thereafter, the controller  150  rotates the ASF motor  102  in the reverse direction to rotate the flow-channel member  82  so that the cap-communication port  84   b  and the pump-communication port  84   d  are connected to communicate with each other. In this condition, the controller  150  rotates the PF motor  101  in the normal direction to activate the aspirator pump  63 . Thereby, the colored inks remaining in the nozzle cap  6   ba  may be removed. 
     In S 205 , a wiping action, in which the ink adhered to the ink discharging surface  12   a  is wiped by the wiper  59 , is conducted. Specifically, the wiper-lifting device  157  is activated to uplift the wiper  59 , and the carriage motor  156  is activated to drive the carriage  11  in the scanning direction. Thereby, the ink adhered to the ink discharging surface  12   a  may be wiped off by the wiper  59 . 
     In S 206 , a flushing action, in which the ink, and the like, that flowed into the nozzles  17  through the wiping action may be removed, is conducted. Specifically, the carriage motor  156  is activated so that the carriage  11  is moved to return to the position, where the ink discharging surface  12   a  faces the capping unit  61 , and the inkjet head  12  is driven to discharge the inks at the capping unit  61  through the nozzles  17 . 
     In S 207 , a post-flushing idle aspiration action, in which the ink collected in the capping unit  61  through the flushing action may be removed, is conducted. The post-flushing idle aspiration action is conducted in the same manner as the post-purging idle aspiration action. After completion of the post-flushing idle aspiration action, the controller  150  rotates the ASF motor  102  in the normal direction to uplift the capping unit  61  and place the printer  1  in the standby state. The maintenance operation ends thereat. 
     According to the present embodiment, the valve cam  85  in the switcher valve  62  is driven by the ASF motor  102 , which is a motor separate from the PF motor  101  to drive the driving rollers  13   a ,  14   a ,  51   a . In this regard, torque of the PF motor  101  to drive the driving rollers  13   a ,  14   a ,  51   a  may be required to have a certain extent of intensity. Therefore, unlike the configuration of the present embodiment, if the PF motor  101  was configured to drive the valve cam  85  additionally to the driving rollers  13   a ,  14   a ,  51   a , it might be necessary that driving torque to drive the valve cam  85  is restricted to be lower. When the driving torque for the valve cam  85  is lower, the valve cam  85  may not be rotated when the ink in the switcher valve  62  clots. The driving torque for the valve cam  85  may be increased by increasing a reduction rate in gears that connect the PF motor  101  with the valve cam  85 . However, with the increased reduction rate, a rotation velocity of the valve cam  85  may be reduced, and actions to switch the ports in the switcher valve  62  may take longer time. 
     In this regard, according to the present embodiment described above, the valve cam  85  is driven by the ASF motor  102 , which is separated from the PF motor  101 . Further, when the valve cam  85  is driven, the ASF switchable gear  122  is engaged with the selector-drivable gear  137   a  but not with the feeder gears  131 - 133 . Therefore, when the valve cam  85  is driven, the driving force from the ASF motor  102  is not transmitted to members or devices (e.g., the feeder rollers  22 ,  32 ,  43 ) other than the valve cam  85 . Thus, without increasing the reduction ratio in the gears that connect the ASF motor  102  with the valve cam  85 , the torque to drive the valve cam  85  may be increased. 
     According to the present embodiment described above, while the ASF switchable gear  122  is engaged with the selector-drivable gear  137 , and when the ASF motor  102  is rotated in the normal direction, the capping unit  61  is moved vertically by the cap-lifting device  66 ; and when the ASF motor  102  is rotated in the reverse direction, the flow-channel member  82  rotates in the switcher valve  62 . Thus, one of the cap-lifting device  66  and the switcher valve  62  may be selectively driven by switching the rotating directions of the ASF motor  102 . Therefore, the cap-lifting device  66  and the ASF motor  102  may be driven by the single motor. 
     According to the present embodiment described above, when the slider  72  is moved to reciprocate along the conveying direction, the cap retainer  71  and the capping unit  61  are moved vertically by the projection  71   e  of the lifting-lowering member  71  being guided on the bottom  76   a   1  of the groove  76   a . Meanwhile, the slider  72  is coupled with the crank gear  73 ; therefore, the slider  71  is moved to reciprocate along the conveying direction as the crank gear  73  rotates in one direction. Thus, by the ASF motor  102  rotating in the normal direction, and the crank gear  73  rotating in one direction, e.g., counterclockwise in  FIGS. 6A, 6B , the capping unit  61  may move vertically. 
     According to the present embodiment described above, when the ASF motor  102  rotates in the normal direction, the planet gear  139   b  engages with the bevel gear  129 ; and when the ASF motor  102  rotates in the reverse direction, the planet gear  139   b  engages with the valve-drivable gear  134   a . Therefore, by controlling the rotating direction of the ASF motor  102 , the ASF motor  102  may be manipulated to drive one of the cap-lifting device  66  and the switcher valve  62  selectively. 
     According to the present embodiment described above, in order to seal the ink discharging surface  12   a  by the cap unit  61 , the ASF motor  102  is rotated in the normal direction so that the planet gear  139   b  is engaged with the bevel gear  129 , and the ASF motor  102  is further rotated in the normal direction to uplift the capping unit  61 . While the capping unit  61  seals the ink discharging surface  12   a , the planet gear  139   b  is engaged with the bevel gear  129 . In this condition, when the planet gear  139   b  is subjected to an external force, such as vibration, the planet gear  139   b  may be separated from the crank gear  73  transiently. In such an event, the slider  72  may slide along the conveying direction, and the capping unit  61  may be separated from the ink discharging surface  12   a . In this regard, according to the present embodiment, the slider  72  has the gear  77   c , and the gear  77   c  is provided with the oil damper  78  so that the slider  72  may be restrained from sliding excessively. Thereby, when the planet gear  139   a  is separated from the crank gear  73  transiently, the capping unit  61  may be prevented from being separated from the ink discharging surface  12   a.    
     According to the present embodiment described above, the conditions of the aspirator pump  63  may be switched between the connected condition and the disconnected condition by controlling the rotating direction of the PF motor  101 . 
     According to the present embodiment described above, when in the standby state, communication between the nozzle caps  61   a ,  61   b  and the aspirator pump  63  is established through the switcher valve  62  while the aspirator pump  63  is in communication with the atmosphere. Therefore, when the flow-channel member  82  adheres to the casing  81 , by activating the aspirator pump  63  but without rotating the flow-channel member  82 , the switcher valve  62  may be cleaned by the flow of the ink from the inkjet head  12 , and the adherence of the flow-channel member  82  to the casing  81  may be resolved. 
     According to the present embodiment described above, the aspirator pump  63  is driven by the PF motor  101 , and the valve cam  85  is driven by the ASF motor  102 . In other words, the aspirator pump  63  and the valve cam  85  are driven independently. Therefore, as described above, when the switcher valve  62  is cleaned, the ink may be drawn to the switcher valve  62  while the flow-channel member  82  may be rotated. 
     In this regard, if, for example, unlike the present embodiment described above, the aspirator pump  63  was in the disconnected condition while the printer  1  is in the standby state, the pressure in the nozzle caps  61   a ,  61   b  may vary. When the pressure in the nozzle caps  61   a ,  61   b  increases, menisci in the ink in the nozzles  17  may collapse. On the other hand, when the pressure in the nozzle caps  61   a ,  61   b  is lowered, the ink may be drawn out of the inkjet head  12  through the nozzles  17  to leak. Meanwhile, according to the present embodiment, the aspirator pump  63  is placed in the connected condition while the printer  1  is in the standby state. Therefore, the pressure in the nozzle caps  61   a ,  61   b  may be maintained steady and prevented from varying. 
     According to the present embodiment described above, the cap-lifting device  66  and the switcher valve  62  are drivable by the ASF motor  102 . Therefore, when the PF motor  101  is rotated in the normal direction to correct skew of the recording sheet P in S 105  ( FIG. 14 ), the capping unit  61  is not moved vertically, or the flow-channel member  82  is not rotated. Meanwhile, the aspirator pump  63  is not activated but is switched to the connected condition. Therefore, when the skew of the recording sheet P is being corrected with the capping unit  61  being sealed to the ink discharging surface  12   a , an undesirable event, such as that one or both of the cap-communication ports  84   a ,  84   b  are connected with the pump-communication port  84   d , and the ink is drawn out of the inkjet head  12  excessively as the aspirator pump  63  operates, may be prevented. 
     For example, unlike the present embodiment described above, the cap-lifting device may not necessarily be driven by the ASF motor  102  but may be configured such that the capping unit  61  is uplifted by a force from the carriage  11  that may push the capping unit  61 . In this configuration, however, impact of contact or conflict between the capping unit  61  and the ink discharging surface  12   a  when the capping unit  61  is pushed upward may need to be controlled to be smaller. In order to reduce the impact of the conflict, an amount to uplift the capping unit  61  vertically with respect to a distance of the travel in the scanning direction for the carriage  11  should be controlled to be smaller. Therefore, the travel distance for the carriage  11  may need to be longer, and accordingly, a distance for the carriage  11  to travel from the position to face with the capping unit  61  to a position to start printing may be extended. Thus, a time period between input of a print job to print an image and start printing the image on the recording sheet P may be extended. 
     In contrast, according to the present embodiment described above, the cap-lifting device  66  is driven by the ASF motor  102  to uplift the capping unit  61 ; therefore, compared to the example mentioned above, the capping unit  61  may be positioned closer to the platen  15 , and the time period between input of a print job to print an image and start printing the image on the recording sheet P may be shortened. 
     According to the printer  1  in the present embodiment, for example, when one or more print jobs containing a large amount of print data is entered, the controller  150  may stop an ongoing printing operation temporarily and process the print data preferentially. In such an event, in order to prevent the ink from drying in the nozzles  17 , it may be preferable that the capping unit  61  is fitted to the ink discharging surface  12   a  while the ongoing printing operation is interrupted. However, unlike the printer  1  in the present embodiment, if the driving rollers  13   a ,  14   a  were driven along with the behavior to place the capping unit  61  to fit to the ink discharging surface  12   a , the recording sheet P may be conveyed by the driving rollers  13   a ,  14   a , and may be displaced from the stopped position. 
     In contrast, according to the present embodiment, the cap-lifting device  66  is driven by the ASF motor  102 , which is separate from the PF motor  101  that drives the driving rollers  13   a ,  14   a . Therefore, when the ongoing printing operation is interrupted temporarily, the driving rollers  13   a ,  14   a  are not rotated while the capping unit  61  is moved to fit to the ink discharging surface  12   a.    
     According to the present embodiment described above, while the ASF switchable gear  122  is engaged with the selector-drivable gear  137 , when the ASF motor  102  is rotated in the normal direction, the capping unit  61  is uplifted; and when the ASF motor  102  is rotated in the reverse direction, the flow-channel member  82  in the switcher valve  62  is rotated. Meanwhile, while the ASF switchable gear  122  is engaged with one of the feeder gears  131 - 133 , when the ASF motor  102  is rotated in the normal or reverse direction, one of the feeder rollers  22 ,  32 ,  43  is rotated so that the recording sheet P is fed to the printing unit  2 . 
     For example, unlike the present embodiment described above, a planetary gear system in a comparative exemplary configuration (a) may be provided between one of the feeder gears  131 - 133  and the ASF input gear  121   a  so that, with the ASF switchable gear  122  being engaged with the one of the feeder gears  131 - 133 , when the ASF motor  102  is rotated in either the normal or reverse direction, the feeder roller corresponding to the one of the feeder gears  131 - 133  may be rotated. With the ASF switchable gear  122  being engaged with the one of the feeder gears  131 - 133 , when the ASF motor  102  is rotated in either the reverse or normal direction that is opposite from the direction to feed the recording sheet P, the capping unit  61  may be uplifted (comparative exemplary configuration a1); or the flow-channel member  82  in the switcher valve  62  may be rotated (comparative exemplary configuration a2). 
     After the aspiration-purging action, in order to perform the idle-aspiration action, it may be necessary that the capping unit  61  is lowered, the flow-channel member  82  is rotated, and the switcher valve  62  is switched from the condition illustrated in  FIG. 15B  to the condition illustrated in  FIG. 15C . In this condition, with the comparative configuration (a1), in order to lower the capping unit  61 , it may be necessary that the ASF switchable gear  122  is placed to engage with the one of the feeder gears  131 - 133 . Alternatively, with the comparative configuration (a2), in order to lower capping unit  61 , it may be necessary that the ASF switchable gear  122  is placed to engage with the selector-drivable gear  137 . Further, in order to rotate the flow-channel member  82 , it may be necessary that the ASF switchable gear  122  is placed to engage with the one of the feeder gears  131 - 133 . 
     Following the aspiration-purging action, in order to conduct the idle-aspiration action, in either the comparative configuration (a1) or (a2), it may be necessary that the ASF switchable gear  122  is moved to switch the engaging mate from the one of the feeder gears  131 - 133  to the selector-drivable gear  137 . Meanwhile, in order to switch the engaging mates of the ASF switchable gear  122  without interference of the current engaging mate, it may be necessary to conduct a disengaging action, in which the ASF motor  102  is driven to rotate the ASF switchable gear  122  finely in the normal and reverse directions alternately for a plurality of times to release the ASF switchable gear  122  from the current engaging mate before the ASF switchable gear  122  is moved. Therefore, in the comparative configurations (a1) and (a2), transition between the aspiration-purging action and the idle-aspiration action may take longer time, and a longer period of time may be required for the maintenance operation. 
     Further, in the comparative configurations (a1) and (a2), transition from the aspiration-purging action to the wiping action may further take longer time. In this regard, the ink in four colors adhered to the ink discharging surface  12   a  during the aspiration-purging may spread over the ink discharging surface  12   a , and the ink in different colors may be mixed with each other and flow back into the nozzles  17 . As a result, in a next printing operation, the contaminated ink may be discharged through the nozzles  17  at the recording sheet P, and quality of the printed image may be lowered. Alternately, in order to remove the contaminated inks through the nozzles  17  sufficiently, it may be necessary that a larger amount of ink is discharged through the nozzles  17  in the flushing action after the wiping action, and the larger amount of ink may be wasted. 
     Further, another comparative configuration (b) may be considered. Unlike the present embodiment described above, the PF switchable gear  112  may be configured to be switchable between a state, in which the PF switchable gear  112  is engaged with the pump-drivable gear  141   a , and a state, in which the PF switchable gear  112  is engaged with the valve-drivable gear  134   a . With the PF switchable gear  112  being engaged with the valve-drivable gear  134   a , when the PF motor  101  is rotated in either the normal or reverse direction, the flow-channel member  82  may be rotated. 
     In this comparative configuration (b), during the aspiration purging action, the PF switchable gear  112  may be engaged with the pump-drivable gear  141   a . After the aspiration-purging action, the PF switchable gear  112  may be switched to engage with the valve-drivable gear  134   a , and the PF motor  101  may be driven so that the flow-channel member  82  may be rotated, and the state of the switcher valve  62  may be switched from the state illustrated in  FIG. 15B  to the state illustrated in  FIG. 15C . Thereafter, the PF switchable gear  112  may be switched to engage with the pump-drivable gear  141   a , and the PF motor  101  is rotated in the normal direction to conduct the idle-aspiration action. In this regard, the disengaging action may be required before the PF switchable gear  112  is moved. Therefore, transition between the aspiration-purging action and the idle-aspiration action may take longer time, and a longer period of time may be required for the maintenance. 
     Further, in the comparative configuration (b), as well as the comparative configurations (a1) and (a2), transition from the aspiration-purging action to the wiping action may further take longer time, and the mixed inks may flow into the nozzles  17  before the wiping action. As a result, in a next printing operation, the contaminated ink may be discharged through the nozzles  17  at the recording sheet P, and quality of the printed image may be lowered. Alternately, in order to remove the contaminated ink through the nozzles  17  sufficiently, it may be necessary that a larger amount of ink is discharged through the nozzles  17  in the flushing action after the wiping action, and the larger amount of ink may be wasted. 
     Meanwhile, there may be an occasion that the PF or ASF switchable gear  112 ,  122  may not be switched smoothly, but the switching of the PF or ASF switchable gear  112 ,  122  may fail. In the case of the comparative configuration (b), when the PF switchable gear  112  fails to engage with the pump-drivable gear  141   a , the ink may not be aspirated in the aspiration-purging action or the idle-aspiration action. In order to prevent the failure in the aspiration, there may be required to provide a sensor to detect success or failure of the switching motion. 
     In contrast, according to the present embodiment, while the ASF switchable gear  122  is engaged with the selector-drivable gear  137 , the ASF motor  102  may be rotated in the normal direction in order to uplift the capping unit  61 , and the ASF motor  102  may be rotated in the reverse direction in order to rotate the flow-channel member  82  in the switcher valve  62 . Therefore, while the ASF switchable gear  122  is engaged with the selector-drivable gear  137  during the maintenance, no switching motion to switch the mating gears may be necessary. Thus, according to the present embodiment, lifting and lowering the capping unit  61 , rotation of the flow-channel member  82  in the switcher valve  62 , and feeding the recording sheets P to the printing unit  2  may be streamlined and conducted more smoothly compared to the comparative configurations (a1), (a2), (b) described above. 
     In the switcher valve  62 , in order to control a rotation angle of the flow-channel member  82  with a certain extent of accuracy, a sensor (not shown) to detect the rotation angle may be provided. With this sensor, the engagements of the PF and ASF switchable gears  112 ,  122  with the valve-drivable gear  134   a  in the present embodiment, or the comparative configurations (a1), (a2), (b), may be detected based on signals output from the sensor. 
     Although an example of carrying out the invention has been described, those skilled in the art will appreciate that there are numerous variations and permutations of the liquid discharging device that fall within the spirit and scope of the invention as set forth in the appended claims. It is to be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or act described above. Rather, the specific features and acts described above are disclosed as example forms of implementing the claims. In the meantime, the terms used to represent the components in the above embodiment may not necessarily agree identically with the terms recited in the appended claims, but the terms used in the above embodiment may merely be regarded as examples of the claimed subject matters. 
     For example, the printer  1  may not necessarily have three (3) sheet feeders such as the lower cassette feeder  3 , the upper cassette feeder  4 , and the tray feeder  5 , with three (3) feeder gears  131 - 133 , which may switchably engage with the ASF switchable gear  122 . For example, the printer may have two (2) or less, or four (4) or more, sheet feeders with two (2) or less, or four (4) or more, feeder gears that may switchably engage with the ASF switchable gear  122 . 
     Specifically, for example, as shown in  FIG. 17 , a printer  200  may have a single cassette feeder  201 . The cassette feeder  201  may be in the same configuration as the upper cassette feeder  4  described above and may be connected with multiple gears including the feeder gear  132  (see  FIGS. 9A-9D ). The ASF switchable gear  122  may be movable along the shaft  106  so that the ASF switchable gear  122  may be selectively in one of the positions illustrated in  FIGS. 9A, 9D, and 9E . 
     In this modified example, if the PF and ASF switchable gears  112 ,  122  are placed in the positions illustrated in  FIG. 9A , and when the ASF motor  102  rotates in the normal direction, the feeder roller  202  may rotate counterclockwise in  FIG. 17  and, in conjunction with the rollers  52 , convey the recording sheet P conveyed through the reversing path  53  toward the feeder path  203 . On the other hand, when the ASF motor  102  rotates in the reverse direction, the feeder roller  202  may rotate clockwise in  FIG. 17  and convey the recording sheet P from the sheet cassette  204  toward the feeder path  203 . 
     According to this modified example, similarly to the previous embodiment described above, the PF switchable gear  112  may be moved to switch engagement and disengagement with the pump-drivable gear  141   a  alone. Meanwhile, the ASF switchable gear  122  may be placed to engage with one of the feeder gear  131  and the selector-drivable gear  137  selectively. Therefore, there may be a risk that the ASF switchable gear  122  is engaged with another gear which should not be engaged with. For example, the capping unit  61  may be lowered for a printing operation, and there may be an attempt to move the ASF switchable gear  122  to the position to engage with the feeder gear  131 . However, the ASF switchable gear  122  may be erroneously caught by the selector-drivable gear  137 . 
     In such an occasion, unlike this modified example, if the recording sheet P was to be conveyed from the sheet cassette  204  toward the feeder path  203  when the ASF motor  102  rotates in the normal direction, there may be a risk that the capping unit  61  is uplifted when the ASF motor  102  rotates in the normal direction to feed the recording sheet P from the sheet cassette  204  toward the printing unit  2 . In this occasion, when the inkjet head  11  is moved to the position to face with the capping unit  61 , the inkjet head  12  or the carriage  11  may collide with the capping unit  61 . 
     In this regard, according to the modified example, the recording sheet P is conveyed from the sheet cassette  203  toward the feeder path  203  when the ASF motor  102  rotates in the reverse direction. Therefore, when the ASF motor  102  is in the reverse rotation to feed the recording sheet P from the sheet cassette  204  to the printing unit  2 , even if the ASF switchable gear  122  is erroneously engaged with the selector-drivable gear  137 , merely the flow-channel member  82  may rotate in the switcher valve  62 , and the capping unit  61  may be prevented from being uplifted. 
     For another example, the configuration to prevent the slider  72  from excessively sliding along the conveying direction when the planetary gear  139   b  is momentarily separated from the crank gear  73  while the capping unit  61  is fitted to the ink discharging surface  12   a  may not necessarily be limited to the gear  77   c  in the slider  72  and the oil damper  78  but may be replaced with by another configuration. Moreover, the configuration to prevent the slider  72  from excessively sliding along the conveying direction may be omitted. 
     For another example, in the embodiment described above, the driving force of the ASF motor  102  may be transmitted selectively to one of the bevel gear  129  and the valve-drivable gear  134  through the planet gear  139   b , which rotates about the axis of the sun gear  139   a , depending on the rotating direction of the ASF motor  102 . However, the driving force of the ASF motor  102  may be transmitted to one of the bevel gear  129  and the valve-drivable gear  134   a  depending on the rotating direction of the ASF motor  102  through a different configuration. 
     For another example, when the ASF motor  102  rotates with the ASF switchable gear  122  being engaged with the selector-drivable gear  137 , the driving force of the ASF motor  102  may not necessarily be transmitted selectively to one of the cap-lifting device  66  and the switcher valve  62  depending on the rotating direction of the ASF motor  102  but may be transmitted selectively to one of the switcher valve  62  and the other drivable devices than the cap-lifting device  66 , depending on the rotating direction of the ASF motor  102 . 
     For another example, the slider  72  may not necessarily be coupled to the crank gear  73 , of which rotation may be converted to linear movement of the slider  72  along the conveying direction, but the crank gear  73  may be replaced with, for example, another device that may convert the rotation of the ASF motor  102  to linear movement of the slider  72  along the conveying direction. 
     For another example, the cap-lifting device  66  may not necessarily be configured such that the projection  71   e  of the lifting-lowering member  71  is guided on the bottom  76   a   1  of the groove  76   a  formed in the slider  72 , which is movable to reciprocate along the conveying direction, as long as the cap-lifting device may move the capping unit  61  both upward and downward when the ASF motor  102  is rotated in the normal direction. 
     For another example, transmission and disconnection of the driving force from the PF motor  101  to the aspirator pump  63  may not necessarily be switchable by engagement and disengagement of the PF switchable gear  111  with the pump-drivable gear  141   a , while the PF switchable gear  112  is engaged with the PF input gear  111 , but may be switched by another switchable configuration. 
     For another example, transmission and disconnection of the driving force from the ASF motor  102  to the feeder rollers  22 ,  32 ,  43 , the switcher valve  62 , and the cap-lifting device  66  may not necessarily be switchable by selective engagement of the ASF switchable gear  112  with one of the feeder gears  131 - 133  and the selector-drivable gear  137 , while the ASF switchable gear  122  is engaged with the ASF input gear  121   a , but may be switched by another switchable configuration. 
     For another example, the PF and ASF switchable gears  112 ,  122  may not necessarily be movable along the scanning direction by being pushed by the carriage  11  but may be moved by a driving force from another source. Further, the PF switchable gear  112  and the ASF switchable gear  122  may not necessarily be movable integrally but may be movable separately by driving forces from different sources. 
     For another example, the cap-lifting device  66  and the switcher valve  62  may not necessarily be driven by the ASF motor  102  that drives the feeder rollers  22 ,  32 ,  43 , but may be driven by another motor different from the PF motor  101  or the ASF motor  102 , which may, for example, drive a cover of the ejection tray to open and close. 
     For another example, in order to place the aspirator pump  63  in the disconnected condition to aspirate the fluid, the PF motor  101  may not necessarily be rotated in the normal direction with the PF switchable gear  112  being engaged with the pump-drivable gear  141   a , or in order to place the aspirator pump  63  in the connected condition, the PF motor  101  may not necessarily be rotated in the reverse direction. The aspirator pump  63  may be switched to the connected condition when the PF motor  101  is rotated in the normal direction and to the disconnected when the PF motor  101  is rotated in the reverse direction to aspirate the fluid. 
     Further, the aspirator pump  63  may not necessarily be driven by the PF motor  101  that drives the driving rollers  13   a ,  14   a ,  51   a , but may be driven by another motor different from the PF motor  101  or the ASF motor  102 . 
     Furthermore, the aspirator pump  63  may not necessarily be switchable between the connected condition and the disconnected condition but may be in the disconnected condition at all time. In this configuration, the cap-communication ports  84   a ,  84   b  may be connected with the air-communication port  84   c  in the standby state so that the nozzle caps  61   a ,  61   b  are in fluid communication with the atmosphere. In this configuration, when the printer  1  is in the standby state, the nozzle caps  61   a ,  61   b  are not in fluid communication with the aspirator pump  63 ; therefore, the valve-cleaning action cannot be performed. In this regard, if dye ink is used in the inkjet head  12  rather than the pigmentary ink, the ink may not easily clot adhesively between the flow-channel member  82  and the casing  81  even after being left for a long period of time. Therefore, absence of the valve-cleaning action may not necessarily cause a problem. 
     In this regard, if the aspirator pump  63  is configured to be switchable between the connected condition and the disconnected condition, as described in the above embodiment, when the PF motor  101  rotates in the normal direction while the aspirator pump  63  is in the connected condition, the conditions of the aspirator pump  63  is switched from the connected condition to the disconnected condition, and as the PF motor  101  rotates further in the normal direction, the aspirator pump  63  starts aspirating the fluid. However, a rotating amount required for the PF motor  101  to switch the condition of the aspirator pump  63  from the connected condition to the disconnected condition may vary among individual PF motors  101 . Therefore, an aspiration amount to aspirate the fluid by the aspirator pump  63  may vary even when the PF motor  101  rotates for a same predetermined amount as different PF motors  101 . 
     Meanwhile, if the aspirator pump  63  is configured to be not switchable between the connected condition and the disconnected condition but to be in the disconnected condition at all times, when the PF motor  101  is activated, the aspirator pump  63  may responsively start aspirating the fluid. Therefore, unlike the embodiment described above, the aspirating amount by the aspirator pump  63  when the PF motor  101  rotates for the predetermined amount may not vary widely, and the aspirating amount by the aspirator pump  63  to aspirate the ink may be controlled more easily. 
     For another example, the switcher valve  62  may not necessarily have the casing  81 , in which the communication ports  84   a - 84   d  are formed, and the flow-channel member  82 , which is rotatable in the casing  81  to switch the connection among the communication ports  84   a - 84   d . For example, the switcher valve may have an outer member, in which communication ports similar to the communication ports  84   a - 84   d  are formed, and a movable member, which may be movable linearly in the outer member to switch the connection among the communication ports. For another example, the switcher valve may be replaced with another device that does not have the outer member or the movable member. 
     For another example, the act (S 105 ) of correcting skew in the recording sheet P being fed from the feeder tray  41 , by switching the rotating direction of the PF motor  101  when the recording sheet P reaches the conveyer roller  13  and rotating the driving roller  13   a  in the opposite direction from the conveying direction, may be omitted. 
     For another example, the recording sheet P may not necessarily be conveyed by the rollers including the conveyer rollers  13 ,  14  but may be conveyed by a different type of conveyer device from the rollers, such as a belt. 
     For another example, the embodiment described above may not necessarily be applied to an inkjet printer, in which the ink is discharged through the nozzles to print an image on the recording sheet P, but may be similarly applied to a liquid ejecting device that may discharge liquid through nozzles at a discharge-object medium.