Patent Publication Number: US-11639280-B2

Title: Medium discharging device, medium processing device, and recording system

Description:
The present application is based on, and claims priority from JP Application Serial Number 2018-173845, filed Sep. 18, 2018, the disclosure of which is hereby incorporated by reference herein in its entirety. 
     BACKGROUND 
     1. Technical Field 
     The present disclosure relates to a medium discharging device discharging a medium, a medium processing device including the medium discharging device, and a recording system including the medium discharging device. 
     2. Related Art 
     A medium processing device performing processing such as stapling processing and punching processing on a medium includes a medium discharging device that stacks the medium, aligning the end portion thereof, in a first tray, performs processing on the stacked medium, and discharges the post-processing medium to a second tray, for example. Such a medium processing device is incorporated into a recording system configured to continuously execute from recording on a medium in a recording device represented by an ink jet printer to follow-up processing such as stapling processing of the post-recording medium in some cases. 
     As an example of such a medium processing device, JP-A-2015-107840 discloses a medium processing device configured to perform stapling processing on a plurality of media stacked on a processing tray 28 as a “first tray”, and discharges the processed media to a placement tray 31 as a “second tray”. 
     In JP-A-2015-107840, a discharge of post-processing medium in the “first tray” to the “second tray” is performed by a discharge roller 29 which nips and feeds the medium by a roller pair. 
     If a media bundle in which a plurality of media overlap with one another is discharged by a roller pair, end portions of the media aligned in the “first tray” are disturbed in some cases. 
     SUMMARY 
     According to an aspect of the present disclosure, there is provided a medium discharging device including a first tray receiving a medium, a second tray receiving the medium discharged from the first tray, a supporter which is configured to be displaced between a retreat position in the first tray and an advance position above the second tray, ahead of the retreat position in a discharge direction from the first tray to the second tray, and which supports the medium, an aligner which is provided in the supporter and which aligns an upstream end portion in the discharge direction of the medium supported by the supporter, to be displaced together with the supporter, and a restrictor configured to be displaced between a restriction position where an upstream movement of the end portion of the medium in a position of the aligner in the discharge direction is restricted and a non-restriction position where the movement is not restricted, when the supporter is in the advance position. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    is a schematic view of a recording system according to a first embodiment. 
         FIG.  2    is a perspective view showing a medium discharging device according to the first embodiment. 
         FIG.  3    is a side sectional view showing the medium discharging device according to the first embodiment. 
         FIG.  4    is a view describing transport of a medium in a processing unit. 
         FIG.  5    is a view describing transport of a medium in the processing unit. 
         FIG.  6    is a bottom surface view showing a main portion of a medium transporting device. 
         FIG.  7    is a side sectional view showing a protruding state of a first peeling unit. 
         FIG.  8    is a side sectional view showing a state where a supporter is in a retreat position, a restrictor is in a non-restriction position, and a medium bundle is placed in a first tray in the medium discharging device. 
         FIG.  9    is a side sectional view showing a state where the supporter supports a medium and is in an advance position and the restrictor is in a non-restriction position in the medium discharging device. 
         FIG.  10    is a side sectional view showing a state where the supporter is in the advance position supporting a medium and the restrictor is in a restriction position. 
         FIG.  11    is a side sectional view showing a state where the supporter is in a retreat position, the restrictor is in the restriction position, and a medium bundle is placed in a second tray. 
         FIG.  12    is a perspective view showing a state of the supporter and the restrictor corresponding to  FIG.  8   . 
         FIG.  13    is a perspective view showing a state of the supporter and the restrictor corresponding to  FIG.  9   . 
         FIG.  14    is a perspective view showing a state of the supporter and the restrictor corresponding to  FIG.  10   . 
         FIG.  15    is a perspective view showing a state of the supporter and the restrictor corresponding to  FIG.  11   . 
         FIG.  16    is a perspective view of the supporter in the retreat position as viewed from below. 
         FIG.  17    is a perspective view showing a state where a third member is removed from the supporter. 
         FIG.  18    is a perspective view of the third member as viewed from below. 
         FIG.  19    is a view of the supporter in the retreat position, corresponding to a sectional view taken along line IXX-IXX of the supporter shown in  FIG.  16   . 
         FIG.  20    is a view of the supporter between the retreat position and the advance position, corresponding to a sectional view taken along line IXX-IXX of the supporter shown in  FIG.  16   . 
         FIG.  21    is a view of the supporter in the advance position, corresponding to a sectional view taken along line IXX-IXX of the supporter shown in  FIG.  16   . 
         FIG.  22    is a schematic view describing a transport position and the retreat position of a driving roller. 
         FIG.  23    is a side sectional view describing the transport position and the retreat position of the driven roller and a first state and a second state of a guider. 
         FIG.  24    is a schematic view describing the first state of the guider. 
     
    
    
     DESCRIPTION OF EXEMPLARY EMBODIMENTS 
     Hereinafter, the present disclosure will be schematically described. 
     A medium discharging device according to a first aspect includes a first tray receiving a medium, a second tray receiving the medium discharged from the first tray, a supporter which is configured to be displaced between a retreat position in the first tray and an advance position above the second tray, ahead of the retreat position in a discharge direction from the first tray to the second tray, and which supports the medium, an aligner which is provided in the supporter and which aligns an upstream end portion in the discharge direction of the medium supported by the supporter, to be displaced together with the supporter, and a restrictor configured to be displaced between a restriction position where an upstream movement of the end portion of the medium in the discharge direction is restricted and a non-restriction position where the movement is not restricted, when the supporter is in the advance position. 
     According to the present embodiment, since a first tray receiving a medium, a second tray receiving the medium discharged from the first tray, a supporter which is configured to be displaced between a retreat position in the first tray and an advance position above the second tray, ahead of the retreat position in a discharge direction from the first tray to the second tray, and which supports the medium, an aligner which is provided in the supporter and which aligns an upstream end portion in the discharge direction of the medium supported by the supporter, to be displaced together with the supporter, and a restrictor configured to be displaced between a restriction position where an upstream movement of the end portion of the medium in the discharge direction is restricted and the non-restriction position where the movement is not restricted, when the supporter is in the advance position, are included, when a plurality of the media are received in the first tray, it is possible to push out and discharge the media to the second tray in a state where the upstream end portions of the media in the discharge direction are aligned. In this way, it is possible to suppress a disturbance of the end portion of the medium. 
     A specific mechanism discharging the medium from the first tray to the second tray will be described below. 
     Further, the restrictor is displaced to the restriction position after the aligner is displaced downstream of the restriction position in the discharge direction and is displaced to the non-restriction position after the aligner is displaced to the retreat position. 
     According to a second aspect, in the first aspect, the supporter is configured to extend along with displacement from the retreat position to the advance position. 
     According to the present aspect, since the supporter is configured to extend along with the displacement from the retreat position to the advance position, it is possible to advance the supporter to the advance position in which advancement is made from the retreat position in the discharge direction while disposing the supporter compactly in the retreat position. 
     According to a third aspect, in the second aspect, the supporter includes a first member which is configured to slide with respect to the first tray in the discharge direction and which has a first rack portion and a second rack portion provided in the discharge direction, 
     a second member which is configured to slide with respect to the first member and which has a third rack portion provided in the discharge direction, a third member which is configured to slide with respect to the first member in the discharge direction and which has a fourth rack portion provided to face the second rack portion in a width direction intersecting with the discharge direction, a first gear engaging with the first rack portion, a second gear having a larger number of teeth formed on a rim than the first gear and engaging with the third rack portion to integrally rotate with the first gear, and a pinion gear having a rotation shaft in the second member and engaging with both the second rack portion and the four rack portion. 
     According to the present aspect, since the supporter includes a first member which is configured to slide in the discharge direction with respect to the first tray and which has a first rack portion and a second rack portion provided in the discharge direction, a second member which is configured to slide in the discharge direction with respect to the first member and which has a third rack portion provided in the discharge direction, a third member which is configured to slide in the discharge direction with respect to the first member and which has a fourth rack portion provided to face the second rack portion in a width direction intersecting with the discharge direction, a first gear engaging with the first rack portion, and a second gear in which a larger number of teeth are formed on a rim than the first gear and which engages with the third rack portion to integrally rotate with the first gear, a speed difference is generated between the first member and the second member moving on a slide. This enables the pinion gear having a rotation shaft in the second member to rotate and the third member to slide to the first member. 
     Thus, it is possible to secure the extension distance of the supporter in the discharge direction by a compact configuration. A specific configuration of a mechanism extending the supporter will be described in detail below. 
     According to a fourth aspect, in the third aspect, the aligner is provided upstream of the third member in the discharge direction. 
     The third member has the longest moving distance in the discharge direction among the first member, the second member, and the third member. 
     According to the present aspect, since the aligner is provided upstream, in the discharge direction, of the third member having the longest moving distance, it is possible to lengthen an extrusion distance of the medium in the discharge direction. 
     According to a fifth aspect, in the third aspect of the fourth aspect, the pinion gear is configured to move downstream of the first tray in the discharge direction. 
     According to the present aspect, since the pinion gear is configured to move downstream of the first tray in the discharge direction, it is possible to securely discharge the medium to the second tray. 
     According to a sixth aspect, in any one of the first to the fifth aspects, a transport belt, positioned above the first tray and configured to transport the medium by adsorbing the medium on a transport surface and rotating, is included, and the restrictor includes a driven roller transporting the medium together with the transport belt when the restrictor is in the restriction position. 
     According to the present aspect, since a transport belt, which is positioned above the first tray and which transports the medium by adsorbing the medium on a transport surface and rotating, is included and the restrictor includes a driven roller transporting the medium together with the transport belt when the restrictor is in the restriction position, it is possible for the driven roller to support the transport of the medium by the transport belt when the restrictor is in the restriction position. 
     According to a seventh aspect, the medium processing device includes the medium discharging device in any one of the first to the sixth aspects and a processor executing predetermined processing on the medium placed in the first tray. 
     According to the present aspect, an operational effect similar to the effect in the first to the sixth aspects is obtained in the medium processing device including a processor executing predetermined processing on the medium placed in the first tray of the medium discharging device. 
     According to an eighth aspect, the recording system includes a recording unit including a recorder performing recording on a medium and a processing unit including the medium discharging device, described in any one of claims  1  to  6 , discharging the post-recording medium in the recording unit and including a processor executing predetermined processing on the medium placed in the first tray. 
     According to the present aspect, an operational effect similar to the effect in the first to the sixth aspects is obtained in the recording system that includes a recording unit including a recorder performing recording on a medium and a processing unit including the medium discharging device discharging the post-recording medium in the recording unit and including a processor executing predetermined processing on the medium placed in the first tray. 
     According to a ninth aspect, in the eighth aspect, an intermediate unit receiving the post-recording medium from the recording unit and delivering the medium to the processing unit is included. 
     According to the present aspect, an operational effect similar to the effect in the eighth aspect is obtained in the recording system including an intermediate unit receiving the post-recording medium from the recording unit and delivering the medium to the processing unit. 
     First Embodiment 
     A first embodiment will be described in the following with reference to drawings. In the X-Y-Z coordinate system shown in each drawing, the X-axis direction is the width direction of a medium and indicates the device depth direction, Y-axis direction is the transport direction of the medium in a medium transport path in the device and indicates the device width direction, and Z-axis direction indicates the device height direction. 
     Overview of Recording System 
     A recording system  1  shown in  FIG.  1    includes a recording unit  2 , an intermediate unit  3 , and a processing unit  4 , for example, sequentially from right to left of  FIG.  1   . 
     The recording unit  2  includes a line head  10  serving as a “recorder” performing recording on a medium. The intermediate unit  3  receives a post-recording medium from the recording unit  2  and delivers the medium to the processing unit  4 . The processing unit  4  includes a medium discharging device  30  discharging a post-recording medium in the recording unit  2  and includes a processor  36  executing predetermined processing on the medium placed in a first tray  35  of the medium discharging device  30 . 
     In the recording system  1 , the recording unit  2 , the intermediate unit  3 , and the processing unit  4  are configured to be coupled to each other and a medium is transported from the recording unit  2  to the processing unit  4 . 
     The recording system  1  is configured such that a recording operation to the medium in the recording unit  2 , the intermediate unit  3 , and the processing unit  4  can be input from an operation panel (not shown). The operation panel can be provided in the recording unit  2 , for example. 
     In the order of the recording unit  2 , the intermediate unit  3 , and the processing unit  4 , the schematic configuration of each will be described. 
     On Recording Unit 
     The recording unit  2  shown in  FIG.  1    is configured as a multi-function apparatus including a printer unit  5  including a line head  10  (recorder) ejecting ink, which is a liquid, onto a medium to perform recording and a scanner unit  6 . In the present embodiment, the printer unit  5  is configured as a so-called ink jet printer. 
     A plurality of medium storage cassettes  7  are provided in a lower part of the recording unit  2 . The medium stored in the medium storage cassette  7  is fed through a transport path  11  denoted by a solid line in the recording unit  2  of  FIG.  1    to a recording area in which recording operation is performed by the line head  10 . The medium after recording by the line head  10  is fed to either a first discharge path  12  serving as a path for discharging the medium to a post-recording discharge tray  8  provided above the line head  10  or a second discharge path  13  serving as a path for feeding the medium to the intermediate unit  3 . The first discharge path  12  is denoted by a broken line and the second discharge path  13  is denoted by a one-dot chain line in the recording unit  2  of  FIG.  1   . 
     The recording unit  2  includes a reversing path  14  denoted by a two-dot chain line in the recording unit  2  of  FIG.  1    and is configured such that a dual recording, in which the medium is reversed after recording on a first surface of the medium and recording is performed on a second surface, is possible. 
     As an example of a unit transporting a medium, a transport roller pair or pairs (not shown) are provided in each of the transport path  11 , the first discharge path  12 , the second discharge path  13 , and the reversing path  14 . 
     A controller  15  controlling an operation concerning transport and recording of a medium in the recording unit  2  is provided in the recording unit  2 . The controller  15  can be configured to control various operations in the processing unit  4 , to be described below, as well as the recording unit  2 . 
     On Intermediate Unit 
     The intermediate unit  3  shown in  FIG.  1    is disposed between the recording unit  2  and the processing unit  4  and is configured to receive the post-recording medium delivered from the second discharge path of the recording unit  2  in the receiving path  20  and transport the medium to the processing unit  4 . The receiving path  20  is denoted by a solid line in the intermediate unit  3  shown in  FIG.  1   . 
     There are two transport paths in which the medium is transported in the intermediate unit  3 . In the first transport path, the medium is transported from the receiving path  20  through a first switchback path  21  to a discharge path  23 . In the second path, the medium is transported from the receiving path  20  through a second switchback path  22  to the discharge path  23 . 
     In the first switchback path  21 , the medium is received in the arrow A 1  direction and then switchbacked in the arrow A 2  direction. In the second switchback path  22 , the medium received in the arrow B 1  direction and then switchbacked in the arrow B 2  direction. 
     The receiving path  20  branches into the first switchback path  21  and the second switchback path  22  at the branching portion  24 . Further, the first switchback path  21  and the second switchback path  22  merge at the merging portion  25 . Therefore, it is possible to deliver the medium from the common discharge path  23  to the processing unit  4  regardless of which switchback path the medium is delivered in from the receiving path  20 . 
     One or more transport pairs (not shown) are provided in each of the receiving path  20 , the first switchback path  21 , the second switchback path  22  and the discharge path  23 . 
     When recording is continuously performed on a plurality of media in the recording unit  2 , the medium that entered in the intermediate unit  3  is alternately fed to a transport path passing through the first switchback path  21  and a transport path passing through the second switchback path  22 . In this way, it is possible to increase the throughput of the medium transport in the intermediate unit  3 . 
     The intermediate unit  3  can also be an omitted recording system. That is, it is possible to configure the processing unit to be directly coupled to the recording unit  2 . 
     Since the transport time is longer when the post-recording medium in the recording unit  2  is fed to the processing unit  4  through the intermediate unit  3  than when the medium is directly fed to the processing unit  4  from the recording unit  2 , it is possible to cause the ink of the medium to further dry before the medium is transported to the processing unit  4 . 
     On Processing Unit 
     The processing unit  4  shown in  FIG.  1    includes the medium discharging device  30  discharging the medium received from the intermediate unit  3  and is configured to perform processing, in the processor  36 , on the medium discharged to the first tray  35  of the medium discharging device  30 . An example of processing performed in the processor  36  includes stapling processing and a punching processing. In the present embodiment, the medium discharging device  30  discharges the medium which is received from the discharge path  23  of the intermediate unit  3  and is transported through the transport path  31 . 
     The processing unit  4  includes a first transport roller pair  32  and a second transport roller pair  33  transporting the medium in a first transport direction and transports the medium toward the medium discharging device  30 . In the present embodiment, since the first transport direction is substantially in the +Y direction, the first transport direction is hereinafter referred to as a first transport direction +Y. 
     A transporter  34  is provided downstream of the second roller pair  33  in the first transport direction +Y. The transporter  34  transports the medium by a transport belt  40  to be described below. The transporter  34  is configured to transport a medium in the first transport direction +Y and the second transport direction opposite to the first transport direction +Y. In the following, the second transport direction will be referred to as a second transport direction −Y. 
     On Medium Discharging Device 
     As shown in  FIG.  3   , the medium discharging device  30  includes a first tray  35  receiving a medium and a second tray  37  receiving the medium discharged from the first tray  35 . A supporter  39 , to be described below, is provided in the first tray  35 . 
     A medium P transported by the transporter  34  is placed in the first tray  35 . A first end portion E 1 , which is an upstream end portion in the +Y direction, which is the discharge direction of the medium P, contacts with the aligner  38  and the position thereof is straightened in the first tray  35 . When a plurality of sheets of medium P are placed in the first tray  35 , the first end portion E 1  is aligned by the aligner  38 . 
     As shown in  FIG.  12    as an example, a plurality of the aligners  38  are provided in the X-axis direction which is the width direction and one of them, the aligner  38 A, is provided in the supporter  39 . 
     In the medium discharging device  30  shown in  FIG.  3   , the first end portion E 1  is straightened by the aligner  38  and a processing such as a stapling processing or the like is performed on one sheet, or a plurality of sheets, of the medium P placed in the first tray  35  by the processor  36  provided in a vicinity of the aligner  38 . The medium P after processing by the processor  36  is discharged to the second tray  37  from the first tray  35 . The second tray  37  receives the medium P after processing by the processor  36  upstream of the first suction area K 1  in the second transport direction −Y. 
     The first tray  35  is provided below the transport belt  40  constituting the transporter  34 , and the medium P, transported in the second transport direction −Y after being transported in the first transport direction +Y by the transport belt  40 , is placed in the first tray  35 . 
     In the following, a method of discharging the medium placed in the first tray  35  to the second tray  37  will be briefly described, and then, the above supporter  39  will be described. The transport of the medium to the first tray  35  by the transport belt  40  will be described after the supporter  39  is described. 
     On Discharge of Medium from the First Tray to the Second Tray 
     Discharge of the medium P from the first tray  35  to the second tray  37  will be described with reference to  FIGS.  8  to  15   .  FIGS.  12  to  15    are perspective views showing states of the supporter and the controller, corresponding to  FIGS.  8  to  11   . 
       FIGS.  8  and  12    show states in which the medium P is placed in the first tray  35 . 
     The supporter  39  provided in the first tray  35  is configured to be displaced between the retreat position in the first tray  35  as shown in  FIGS.  8  and  12    and the advance position above the second tray  37 , ahead of the retreat position in the +Y direction which is the discharge direction from the first tray  35  to the second tray  37 , as shown in  FIGS.  9  and  13   . The supporter  39  can support the medium P in both the retreat position and the advance position. The supporter  39  is provided with the aligner  38 A and moves following the displacement of the supporter  39 . 
     When the medium P is placed in the first tray  35  by the transport belt  40 , the supporter  39  is disposed in the retreat position shown in  FIGS.  8  and  12   . The supporter  39  supports the medium P together with the place surface of the first tray  35  and performs processing on the medium P by the processor  36  in this state in  FIGS.  8  and  12   . 
     When the processing by the processor  36  is performed on the medium P placed on the first tray  35 , the medium P is discharged from the first tray  35  to the second tray  37 . 
     When the medium P is discharged from the first tray  35  to the second tray  37 , the supporter  39  moves from the retreat position shown in  FIGS.  8  and  12    to the advance position shown in  FIGS.  9  and  13   . Since the aligner  38 A is provided in the supporter  39  and moves together with the supporter  39 , the supporter  39  moves to the advance position while supporting the medium P. 
     Here, the medium discharging device  30  includes a restrictor configured to be displaced, in the +Y direction which is the discharge direction, between the restriction position ( FIG.  10   ) where an upstream movement of the first end portion E 1  of the medium P in the position of the aligner  38 A moving together with the supporter  39  is restricted and the non-restriction position ( FIG.  9   ) where the movement is not restricted, when the supporter  39  is in the advance position. 
     The restrictor  60  protrudes from the placement surface of the first tray  35  in the restriction position as shown in  FIGS.  10  and  14    and retreats to the first tray  35  side in the non-restriction position as compared with the restriction position as shown in  FIGS.  9  and  13   . 
     In the present embodiment, the restrictor  60  is provided in the base portion  62  swinging about a pivot shaft  60   a  shown in  FIGS.  9  and  10    and is configured to swing between the restriction position ( FIG.  10   ) and non-restricting position ( FIG.  9   ). The base portion  62  including the restrictor  60  swings by the power of a driving source (not shown). 
     As shown in  FIGS.  12  to  15   , the restrictor  60  is disposed in a position deviating from the supporter  39  in the X-axis direction which is the width direction. More specifically, the restrictor  60  is provided on both sides of the supporter  39  in the width direction. 
     When the supporter  39  moves to the advance position shown in  FIGS.  9  and  13   , the restrictor  60  is displaced to the restriction position as shown in  FIGS.  10  and  14   . 
     Then, as the supporter  39  returns to the retreat position as shown in  FIGS.  11  and  15    in a state where the movement of the medium P in the −Y direction is restricted by the restrictor  60  in the restriction position, the medium P not supported by the supporter  39  falls onto the second tray  37  as shown in  FIG.  11   . In this way, the medium P is discharged from the first tray  35  to the second tray  37  such that, when a plurality of media P are placed in the first tray  35 , it is possible to push out and discharge the medium P to the second tray  37  while maintaining the alignment of the first end portion E 1  of the medium P aligned by the aligner  38 . 
     Next, the configuration of the supporter  39  will be described mainly with reference to  FIGS.  16  to  21   . 
     In the medium discharging device  30 , the supporter  39  is configured to extend along with the displacement from the retreat position shown in  FIG.  8    to the advance position shown in  FIG.  9   . Since the supporter  39  is configured to extend along with the displacement from the retreat position to the advance position, it is possible to secure distance of the supporter  39  from the retreat position to the advance position of the supporter  39  while compactly disposing the supporter  39  in the retreat position in the first tray  35 . 
     In the present embodiment, the configuration of the supporter  39  extending along with the displacement from the retreat position to the advance position is as follows. 
     The supporter  39  shown in  FIG.  16    includes a first member  71 , a second member  72 , a third member  73 , a first gear  74 , a second gear  75 , and a pinion gear  77  ( FIG.  17   ). 
     As shown in  FIGS.  19  to  21   , the first member  71  is configured to slide with respect to the first tray  35  in the discharge direction in the Y-axis direction and has a first rack portion  81  ( FIG.  16   ) and a second rack portion  83  ( FIG.  17   ) provided in the Y-axis direction. As shown in  FIGS.  20  and  21   , the first member  71  is configured to slide with respect to the groove portion  78  extending in the Y-axis direction in the first tray  35 . 
     In the supporter  39  shown in  FIG.  16   , the second member  72  is configured to slide with respect to the first member  71  in the Y-axis direction and has a third rack portion  82  provided in the Y-axis direction. 
     The third member  73  is configured to slide with respect to the first member  71  in the discharge direction in the Y-axis direction and has a fourth rack portion  84  as shown in  FIG.  18   . The third member  73  shown in  FIG.  18    has a guide portion  85  on both sides in the width direction, the guide portion  85  is guided by a protruding portion  71   a  in the groove portion  79  of the first member  71  shown in  FIG.  17   , and the third member  73  slides with respect to the first member  71 . As shown in  FIGS.  19  to  21   , the fourth rack portion  84  is provided to face the second rack portion  83  of the first member  71  in the X-axis direction which is the width direction intersecting with the discharge direction. The aligner  38 A provided in the supporter  39  is provided in the third member. 
     Further, in the supporter  39  shown in  FIG.  16   , the first gear  74  engages with the first rack portion  81 . The second gear  75  has a larger number of teeth formed on a rim than the first gear  74  and engages with the third rack portion  82  to integrally rotate with the first gear  74 . The first gear  74  and the second gear  75  are provided on the same rotation shaft  76 . The first gear  74  and the second gear  75  are rotated by the rotation shaft  76  rotated by the force of a driving source (not shown). The first gear  74  and the second gear  75  are configured to rotate in both the +R direction and the −R direction denoted by a double arrow in  FIG.  16   . 
       FIG.  16    shows a state where the supporter  39  is in the retreat position, and, as shown in  FIG.  8   , the first gear  74  and the second gear  75  are provided in the end portion of the first tray  35  in the +Y direction. 
     The pinion gear  77  shown in  FIG.  17    has a rotation shaft  86  in the second member  72  and engages with both the second rack portion  83  and the fourth rack portion  84  as shown in  FIGS.  19  to  21   . 
     If the first gear  74  and the second gear  75  shown in  FIG.  16    are rotated in the +R direction from a state where the supporter  39  is in the retreat position, the supporter  39  starts to move toward the advance position in the +Y direction. 
     More specifically, if the first gear  74  and the second gear  75  are rotated in the +R direction, the first member  71  having the first rack portion  81  engaging with the first gear  74  and the second member  72  having the third rack portion  82  engaging with the second gear  75  move in the +Y direction respectively. 
     Since the second gear  75  has a larger number of teeth formed on the rim than the first gear  74 , the moving speed of the second member  72  is higher than the moving speed of the first member  71 . That is, a speed difference is generated between the moving first member  71  and second member  72 . 
     If a speed difference is generated between the first member  71  and the second member  72 , the pinion gear  77  having the rotation shaft  86  ( FIG.  17   ) in the second member  72  rotates. In this way, it is possible to slide the third member  73  with respect to the first member  71 . 
     In  FIG.  17   , if the first gear  74  and the second gear  75  are rotated in the +R direction, the pinion gear  77  rotates in the +S direction and the third member  73  ( FIG.  15   ) moves in the +Y direction. 
     In the present embodiment,  FIG.  21    shows the moving distance of each of the first member  71 , the second member  72 , and the third member  73  when the supporter  39  moves from the retreat position shown in  FIG.  19    to the advance position shown in  FIG.  21   . When the moving distance of the first member  71  is defined as a distance L 1 , the moving distance of the second member  72  having a higher moving speed is a distance L 2  longer than the distance L 1 . Further, when the moving distance of the third member  73  with respect to the first member  71  is defined as a distance L 3 , the total moving distance of the third member  73  becomes a distance (L 1 +L 3 ), and the third member  73  ends up moving the longest distance among the first member  71 , the second member  72 , and the third member  73 . 
     The aligner  38 A shown in  FIG.  16    is provided upstream of the third member  73  in the discharge direction as described above. Since the aligner  38 A is provided in the third member  73  having the longest moving distance among the first member  71 , the second member  72 , and the third member  73  constituting the supporter  39 , it is possible to lengthen the extrusion distance of the medium in the discharge direction. 
     The supporter  39  is moved from the advance position shown in  FIG.  21    to the retreat position shown in  FIG.  19    by the rotation of the first gear  74  and the second gear  75  shown in  FIG.  17    in the −R direction. 
     Further, in the present embodiment, as shown in  FIG.  9   , the pinion gear  77  is configured to move downstream of the first tray  35  in the +Y direction which is the discharge direction. In this way, it is possible to discharge the medium P to the second tray  37  more securely. 
     It is possible to detect the position of the supporter  39  by a supporter detector  90  shown in  FIG.  16   . The supporter detector  90  is provided on the first tray  35  side and is configured with a transmission-type optical sensor, for example. 
     Other Configurations of Restrictor 
     In the present embodiment, the restrictor  60  includes a driven roller  61  transporting the medium P together with the transport belt  40  when the restrictor  60  is in the restriction position shown in  FIGS.  11  and  15   . 
     Here, in the processing unit  4 , in order to improve the throughput when a plurality of sheets of medium are stacked in the first tray  35 , as shown in  FIG.  22   , in some cases overlapping transport processing is performed, in which a preceding medium P 1  transported first and the succeeding medium P 2  transported next to the preceding medium overlap with each other and then are transported to the first tray  35 . The overlapping transport processing may be called buffer processing. 
     If two sheets of the preceding medium P 1  and the succeeding medium P 2  are adsorbed onto the transport belt  40 , the preceding medium P 1  positioned on a lower side in  FIG.  22    does not directly contact with the transport surface  40   a , and thus, is not adsorbed. When the preceding medium P 1  and the succeeding medium P 2  are different in size or the preceding medium P 1  and the succeeding medium P 2  slightly deviate from each other even if the size is the same, the preceding medium P 1  may be adsorbed a little, but adsorption force is insufficient. Therefore, the preceding medium P 1  may not be appropriately transported to the first tray  35  by the transport belt  40 . 
     As shown in  FIG.  22   , since the restrictor  60  includes a driven roller  61  transporting the medium P together with the transport belt  40  when in the restriction position denoted by a solid line in  FIG.  22   , it is possible to position the restrictor  60  in the restriction position and transport the preceding medium P 1  and the succeeding medium P 2  nipped between the transport belt  40  and the driven roller  61  when the preceding medium P 1  and the succeeding medium P 2  are transported by the transport belt  40 , overlap with each other. That is, it is possible to support the transport of the medium P by the transport belt  40  with the driven roller  61 . 
     In  FIG.  22   , the succeeding medium P 2  is superimposed on the preceding medium P 1 , but it can be reversed, of course. 
     On Driven Roller 
     Focusing on the driven roller  61 , the driven roller  61  is configured to move between the transport position where the medium P can be nipped between the transport belt  40  and the driven roller  61  as shown in an upper diagram of  FIG.  23    and the retreat position farther from the transport belt than the transport position as shown in a lower diagram of  FIG.  23   . The driven roller  61  in the transport position is denoted by a solid line and the driven roller  61  in the retreat position is denoted by a dotted line in  FIG.  22   . 
     More specifically, the driven roller  61  is supported by the base portion  62  including the restrictor  60  to be described below. The base portion  62  swings about the pivot shaft  60   a  and the driven roller  61  moves between the transport position and the retreat position. 
     Then, the driven roller  61  is in the retreat position when a single sheet of the medium P is transported in the transport belt  40  and in the transport position when a plurality of sheets of medium P are transported in the transport belt  40  as shown in  FIG.  22   . 
     For example, as shown in an upper diagram of  FIG.  4   , since the medium P is adsorbed on the transport surface  40   a  when a single sheet of medium P is transported, the driven roller  61  is in the retreat position, and it is possible to transport only by the adsorption force in the transport belt  40 . 
     On the other hand, since the driven roller  61  is in the transport position when a plurality of sheets of medium P are transported in the transport belt  40  as shown in  FIG.  22   , it is possible to transport the overlapping preceding medium P 1  and the succeeding medium P 2  nipped between the driven roller  61  and the transport belt  40 . Therefore, it is possible to transport, and appropriately place in the first tray  35 , the preceding medium P 1  and the succeeding medium P 2  in an overlapping state even if the preceding medium P 1  positioned below is not adsorbed on the transport surface  40   a.    
     Further, as shown in  FIG.  22   , when a first driven roller  63  configured to rotate by the movement of the transport belt  40  is provided inside the ring of the transport belt  40  and the driven roller  61  is in the transport position, the transport belt  40  is nipped between the driven roller  61  and the first driven roller  63 . In this way, it is possible to suppress an increase in a driving load of the transport belt  40  when the driven roller  61  is in the transport position. 
     On Guider 
     Next, a guider  80  provided in the −Y direction of the driven roller  61  will be described. 
     The guider  80  is configured to switch between a first state shown in a lower diagram of  FIG.  23    and a second state shown in an upper diagram of  FIG.  23   , and the guider  80  switching from the second state to the first state along with the movement of the driven roller  61  from the retreat position (the upper diagram of  FIG.  23   ) to the transport position (lower diagram of  FIG.  23   ) is provided. 
     The guider  80  in the first state shown in the lower diagram of  FIG.  23    is in a state of guiding a medium in a direction between the driven roller  61  in the transport position and the transport belt  40 . The guider  80  in the second state shown in the upper diagram of  FIG.  23    is along the placement surface of the first tray  35 . 
     The guider  80  is also shown in  FIGS.  12  to  15   .  FIGS.  12  and  13    show the second state of the guider  80  and  FIGS.  14  and  15    show the first state of the guider  80 . 
     If the guider  80  is in the first state, as shown in  FIG.  24   , the preceding medium P 1  is transported by a second transport roller pair  33 , advancing along the guider  80  even when, out of two sheets of media P of the overlapping preceding medium P 1  and the succeeding medium P 2 , the preceding medium P 1  below is not adsorbed on the transport surface  40   a  to hang down. In this way, it is possible to guide and nip the leading end in the first transport direction +Y of the preceding medium P 1  between the driven roller  61  in the transport position and the transport belt  40 . 
     Since the guider  80  switches from the second state to the first state along with the movement of the driven roller  61  from the retreat position to the transport position, it is possible to bring the guider  80  into the first state when the driven roller  61  moves to the transport direction, that is, when a plurality of sheets of medium P are transported by the transport belt  40 . Therefore, it is possible to guide the preceding medium P 1  positioned below and not adsorbed on the transport surface  40   a , out of a plurality of media P, between the driven roller  61  and the transport belt  40 . 
     In the present embodiment, the guider  80  includes a first arm  91  which is positioned upstream of the driven roller  61  with respect to the first transport direction +Y and which constitutes the guider  80  and a second arm  92  which is positioned upstream of the first arm  91  with respect to the first transport direction +Y and which is connected with the first arm  91 , and the first arm in the first state shown in the lower diagram of  FIG.  23    configured to form a posture so as to shorten the distance between the surface facing the transport belt  40  and the transport belt  40  facing the driven roller  61 . 
     On Transporter 
     Next, the transporter  34  transporting the medium by the transport belt  40  will be described in detail. 
     In the transporter  34  shown in  FIG.  3   , the transport belt  40  has the first adsorption area K 1  as an “adsorption area” in which the medium is adsorbed on the transport surface  40   a  and is configured to transport the medium in the first transport direction +Y and the second transport direction −Y by adsorbing the medium in the adsorption area and rotating. The transport belt  40  is disposed above the medium P to be transported. That is, the transport belt  40  is configured to adsorb and transport the medium from above. 
     In the present embodiment, a second adsorption area K 2  in which the medium is adsorbed is provided upstream of the first adsorption area K 1  in the first transport direction +Y. It is possible to omit the second adsorption area K 2  in the transporter  34 . 
     As shown in  FIG.  2   , two transport belts  40  are provided at an interval in the X-axis direction which is a width direction intersecting with the first transport direction +Y. 
     As shown in  FIG.  3   , the annular transport belt  40  is wound around four rollers of a first roller  46 A, a second roller  46 B, a third roller  46 C, and a fourth roller  46 D. The fourth roller  46 D is configured to rotate clockwise and counterclockwise in  FIG.  3    by the power of a drive source (not shown). 
     The transport belt  40  adsorbs the medium in the first adsorption area K 1  and the second adsorption area K 2  positioned between the first roller  46 A and the fourth roller  46 D. 
     In  FIG.  3   , if the fourth roller  46 D rotates clockwise, the transport belt  40  also rotates clockwise and the medium adsorbed by the transport belt  40  is transported in the first transport direction +Y. Conversely, if the fourth roller  46 D rotates counterclockwise, the transport belt  40  also rotates counterclockwise and the medium adsorbed by the transport belt  40  is transported in the second transport direction −Y. The third roller  46 C is configured to move in a direction along a long hole  48  shown in  FIG.  3    and to adjust the tension of the transport belt  40 . 
     The transporter  34  has a plurality of holes  41  as shown in  FIG.  2    and includes the annular transport belt  40  driven to rotate and a first suction unit  43  provided inside the ring of the transport belt  40  as shown in  FIG.  3   . The first suction unit  43  generates an adsorption force in a part of the plurality of holes  41  subjected to a negative pressure by the first sucker  42 . A suction pump or a suction fan can be used as the first sucker  42 . 
     More specifically, in the first suction unit  43  shown in  FIG.  3   , the internal space is subjected to the negative pressure by the suction of the first sucker  42 . A lower portion of the first suction unit  43  facing the transport belt  40  is opened and a suction force is generated in the holes  41  of the transport belt  40  passing below the first suction unit  43  subjected to the negative pressure. The adsorption area corresponding to the first suction unit  43  is the first adsorption area K 1 . 
     A first peeler  51  shown in  FIG.  3    is provided in a position corresponding to the first suction area K 1  in the second transport direction −Y. The first peeler  51  is configured to switch between a protrusion state where the first peeler  51  protrudes from the transport surface  40   a  of the transport belt  40  as shown in  FIG.  7    and a retreat state where the first peeler  51  does not protrude from the transport surface  40   a  as shown in  FIG.  3   . By switching from the retreat state shown in  FIG.  3    to the protrusion state shown in  FIG.  7   , the first peeler  51  peels the medium P from the transport belt  40 . 
     Further, a second suction unit  45 , in which an adsorption force is generated in a part of the plurality of holes  41  subjected to negative pressure by a second sucker  44 , is provided upstream in the first transport direction +Y of the first suction unit  43  in  FIG.  3   . If a switching position F shown in a lower diagram of  FIG.  4    to be described below is set to be a reference, the second suction unit  45  is disposed between the second transport roller pair  33  in the first transport direction +Y and the switching position F inside the ring of the transport belt  40 . 
     The second sucker  44  sucks the air inside the second suction unit  45  through a conduit  47  to subject the inside of the second suction unit  45  to negative pressure. A suction pump or a suction fan can be used as the second sucker  44 . The adsorption area corresponding to the second suction unit  45  is the second adsorption area K 2 . 
     As described with reference to  FIGS.  4  and  5   , the transport belt  40  is configured to adsorb the medium P delivered from the second transport roller pair  33  on the transport belt  40  to transport the medium P in the first transport direction +Y such that the first end portion E 1  of the medium is transported to the predetermined switching position F and the medium P is transported in the second transport direction −Y to be placed in the first tray  35 . 
     In the following, the transport of the medium P to the first tray  35  by the transporter  34  will be described with reference to  FIGS.  4  and  5   . 
     The medium P transported in the first transport direction +Y by the second transport roller pair  33  is adsorbed on the transport belt  40  by the adsorption force in the first adsorption area K 1  and the second adsorption area K 2  and is transported in the first transport direction +Y, as shown in the upper diagram of  FIG.  4   . The white arrow indicates the moving direction of the transport belt  40  in the upper diagram of  FIG.  4   . That is, the transport belt  40  rotates clockwise in a plan view of the upper diagram of  FIG.  4   . 
     If the medium P is further transported from the state of the upper diagram of  FIG.  4    and the first end portion E 1  of the medium P reaches the switching position F as shown in the lower diagram of  FIG.  4   , the rotation of the transport belt  40  is reversed and the medium P is transported in the second transport direction −Y. That is, the transport belt  40  is rotated counterclockwise in the plan view of the lower diagram of  FIG.  4   . 
     In the present embodiment, a medium detector  49  is provided between the transporter  34  and the second transport roller pair  33 , and it is possible to determine the switching timing of the rotation direction of the transport belt  40  based on the detection of the medium P in the medium detector  49 . 
     For example, the transport belt  40  is rotated clockwise by as much as a predetermined driving amount after the medium detector  49  detects the first end portion E 1  of the medium P transported in the first transport direction +Y, and the transport belt  40  is rotated counterclockwise once the first end portion E 1  is transported to the switching position F. 
     Further, the medium detector may be provided in the switching position F and the rotation direction of the transport belt  40  may be switched at the detection timing of the first end portion E 1  in the switching position F. 
     A second peeler  52  peeling from the transport belt  40  the medium P adsorbed in the second adsorption area K 2  of the transport belt  40  is provided in the transporter  34 . The second peeler  52  has a pivot shaft  52   a  upstream in the second transport direction −Y with respect to the second adsorption area K 2  and swings with a downstream end as a free end. The second peeler  52  is positioned inside the rim of the transport belt  40  as shown in the upper diagram of  FIG.  4    when the medium P is adsorbed in the second adsorption area K 2  and swings to protrude outside the rim of the transport belt  40  as shown in an upper diagram of  FIG.  5    when the medium P adsorbed in the second adsorption area K 2  is peeled from the transport belt  40 . 
     As shown in  FIG.  6   , the second peeler  52  includes a second peeler  52 A provided between the two transport belts  40  which is the width direction and a second peeler  52 B and a second peeler  52 C provided on two sides of the two transport belts  40  in the X-axis direction. That is, a plurality of the second peelers  52  are provided in the X-axis direction which is the width direction intersecting with the second transport direction −Y. 
     After the first end portion E 1  of the medium P transported in the first transport direction +Y is positioned in the switching position F, the second peeler  52  is made to protrude outside the rim of the transport belt  40  before the transport direction of the medium P is switched from the first transport direction +Y to the second transport direction −Y. 
     In this way, it is possible to guide the medium P toward the first tray  35  positioned below the transport belt  40  while suppressing a re-adsorption of the medium P in the second adsorption area K 2  when the medium P is transported in the second transport direction −Y. 
     Further, the transporter  34  includes the first peeler  51  in a position corresponding to the first adsorption area K 1  described above. 
     If the medium P is fed by the transport belt  40  in the second transport direction −Y, the first end portion E 1  of the medium P is positioned in the aligner  38  of the first tray  35  as shown in the upper diagram of  FIG.  5   , the rotation of the transport belt  40  is stopped, the first peeler  51  is switched from the retreat position to the protrusion state shown in a lower diagram of  FIG.  5   , and the medium P is peeled from the first adsorption area K 1 . Therefore, it is possible to place the medium P in the first tray  35  in a state where the first end portion E 1  of the medium P is straightened in the predetermined position. 
     It is possible to determine that the first end portion E 1  of the medium P is transported to the position of the aligner  38  and stop the rotation of the transport belt  40  when predetermined time elapses after the transport direction of the medium P is switched from the first transport direction +Y to the second transport direction −Y. Further, it is possible to provide a detector configured to detect the first end portion E 1  in the position of the aligner  38  and stop the rotation of the transport belt  40  at the time when the detector detects the first end portion E 1 . 
     As the first peeler  51  is brought into the protrusion state, the second peeler  52  retreats to the transport surface  40   a  side as shown in a lower diagram of  FIG.  5    and it is possible to adsorb the medium P in the second adsorption area K 2 . 
     Therefore, if the medium transported earlier is taken as a preceding medium P 1 , it is possible to receive and adsorb the succeeding medium P 2  successively transported in the second adsorption area K 2  while peeling the preceding medium P 1  from the transport belt  40  by the first peeler  51  and placing the medium P 1  in the first tray  35 . 
     When the succeeding medium P 2  is transported following the preceding medium P 1 , the first peeler  51  is configured to be displaced from the retreat state shown in the upper diagram of  FIG.  5    to the protrusion state shown in the lower diagram of  FIG.  5   , press the preceding medium P 1  placed in the first tray  35 , maintaining the protrusion state, after the preceding medium P 1  is peeled from the transport belt  40 , and be displaced to the retreat position before the succeeding medium P 2  reaches the first adsorption area K 1 , when the succeeding medium P 2  is transported following the preceding medium P 1 . In this way, it is possible to alleviate the concern that the preceding medium P 1  placed in the first tray  35  floats up and is adsorbed again on the transport belt  40  by the time the succeeding medium P 2  reaches the first adsorption area K 1 . 
     It is possible to set the timing of the first peeler  51  in the protrusion state in the lower diagram of  FIG.  5    returning to the retreat state after an elapse of a predetermined time from the detection of the succeeding medium P 2  by the medium detector  49 , for example. It is possible to set the predetermined time within a range where the succeeding medium P 2  transported in the first transport direction +Y does not reach the first adsorption area K 1  after the succeeding medium P 2  is detected by the medium detector  49 . 
     Further, for example, it is possible to provide a medium detector separate from the medium detector  49  downstream of the medium detector  49  in the first transport direction +Y and upstream of the first adsorption area K 1  and bring the first peeler  51  into the retreat state at the time when the medium detector detects the succeeding medium P 2 . 
     It is desirable that the first peeler  51  is in the protrusion state until immediately before the succeeding medium P 2  reaches the first adsorption area K 1 . In this way, it is possible to further alleviate the concern of re-adsorption of the preceding medium P 1  on the transport belt  40 . 
     The first peeler  51  and the second peeler  52  swing by the power of a driving source (not shown). It is possible to drive the first peeler  51  and the second peeler  52  by a common driving source. It is needless to say that the peelers may be driven by separate driving sources. 
     Further, in the present embodiment, the transport belt  40  is of a suction and adsorption type, but it is also possible to use a transport belt of an electrostatic adsorption type, for example. 
     Further, the adsorption area in the transport belt  40  can be made of only the first adsorption area K 1 , the second adsorption area K 2  being omitted, and it is possible to configure the transport belt  40  with three or more adsorption areas to which adsorption force is imparted by individual suckers and suction units. 
     In the present embodiment, it is possible to regard the processing unit  4  as a “medium processing device” including the medium discharging device  30  and the processor  36  executing predetermined processing on the medium placed in the first tray  35 . Further, it is possible to regard the recording system  1  as a “medium processing device” including the medium discharging device  30  and the processor  36  executing predetermined processing on the medium placed in the first tray  35 . Further, it is also possible to regard the recording system  1  minus the recording function as a “medium discharge device”. Alternatively, from the viewpoint of the medium discharging, it is possible to regard the recording system  1  itself as a recording discharging device even if the recording function is included. 
     Further, it is needless to say that the present disclosure is not limited to the above embodiment, that various modifications are possible within the scope of the disclosure described in the claims, and that the modifications are also included within the scope of the present disclosure.