Medium transport device, liquid ejection device, and post-process device

Abstract

A medium transport device 29, a liquid ejection device 13, and a post-process device 15 include a recording path 38; a first transport path 40 arranged downstream of the recording path 38; an inversion path 39 arranged downstream of the recording path 38; a first branch section 51; and a blower section 50 configured to transport the medium 19 to either the first transport path 40 or the inversion path 39, wherein when a medium 19 that is transported first is defined as a first medium and a medium 19 that is transported subsequently to the first medium is defined as a second medium, in a case where the blower section 50 switches a transport destination between the first medium and the second medium, the blower section 50 starts the switching operation while the first medium is passing through the first branch section 51.

What is claimed is: 
     
         1 . A medium transport device comprising:
 a first path configured to transport a medium;   a second path arranged downstream of the first path and configured to transport a medium;   a third path arranged downstream of the first path and configured to transport a medium;   a branch section at which the first path branches into the second path and the third path; and   a blower section configured to perform a switching operation for switching a transport destination of the medium transported on the first path by blowing air, and configured to transport the medium to either the second path or the third path, wherein   when a medium that is transported first is defined as a first medium and a medium that is transported subsequently to the first medium is defined as a second medium, in a case where the blower section switches a transport destination between the first medium and the second medium, the blower section starts the switching operation while the first medium is passing through the branch section.   
     
     
         2 . The medium transport device according to  claim 1 , further comprising:
 a flap member configured to be displaced to a first position at which the medium is transported to the second path and a second position at which the medium is transported to the third path, wherein   the flap member is displaced in accordance with a transport destination of the medium when a basis weight of the medium is larger than a threshold.   
     
     
         3 . The medium transport device according to  claim 1 , wherein
 the blower section includes
 a first blower section configured to blow air to a first surface of the medium and 
 a second blower section configured to blow air to a second surface of the medium opposite from the first surface. 
   
     
     
         4 . The medium transport device according to  claim 3 , wherein
 the first blower section blows air to the medium by sucking air and   the second blower section blows air to the medium by spraying air.   
     
     
         5 . The medium transport device according to  claim 1 , wherein
 the second path is a path that transports the medium to a first discharge section that discharges the medium with a first surface facing downward and   the third path is a path that transports the medium to a second discharge section that discharges the medium with the first surface facing upward.   
     
     
         6 . The medium transport device according to  claim 1 , further comprising:
 a recording section configured to perform recording on the medium, wherein   the second path is a path that transports the medium to a discharge section that discharges the medium recorded by the recording section and   the third path is a path that returns the medium recorded by the recording section to upstream of the recording section.   
     
     
         7 . The medium transport device according to  claim 1 , further comprising:
 a recording section configured to perform recording on the medium;   a determination section configured to determine a recording state of the medium recorded by the recording section;   a first tray to which the medium determined as normal recording by the determination section is discharged; and   a second tray to which the medium determined as abnormal recording by the determination section is discharged, wherein   the second path is a path that transports the medium to the first tray and   the third path is a path that transports the medium to the second tray.   
     
     
         8 . The medium transport device according to  claim 1 , further comprising:
 a recording section configured to perform recording on the medium, wherein   the blower section changes a blowing amount in accordance with a recording condition of the recording section.   
     
     
         9 . The medium transport device according to  claim 1 , wherein
 the blower section blows air containing ions.   
     
     
         10 . The medium transport device according to  claim 1 , wherein
 as the switching operation, the blower section changes a blowing amount blown to the medium.   
     
     
         11 . The medium transport device according to  claim 10 , wherein
 as the switching operation, the blower section changes air blown to the medium from a first blowing amount at which a transport direction of the medium does not change to a second blowing amount at which a transport direction of the medium changes by an amount larger than the first blowing amount.   
     
     
         12 . The medium transport device according to  claim 1 , further comprising:
 a fourth path that is connected to the first path, the second path, and the third path at the branch section and that is a straight path with respect to the first path, wherein   the blower section does not blow air when a transport destination of the medium is set to the fourth path.   
     
     
         13 . A liquid ejection device comprising:
 an ejection section configured to eject liquid on a medium;   a first path configured to transport the medium on which liquid is ejected by the ejection section;   a second path arranged downstream of the first path and configured to transport a medium;   a third path arranged downstream of the first path and configured to transport a medium;   a branch section at which the first path branches into the second path and the third path; and   a blower section configured to perform a switching operation for switching a transport destination of the medium transported on the first path by blowing air, and configured to transport the medium to either the second path or the third path, wherein   when a medium that is transported first is defined as a first medium and a medium that is transported subsequently to the first medium is defined as a second medium, in a case where the blower section switches a transport destination between the first medium and the second medium, the blower section starts the switching operation while the first medium is passing through the branch section.   
     
     
         14 . A post-process device connected to a liquid ejection device, the post-process device comprising:
 an introduction section configured to introduce a medium on which liquid is ejected by an ejection section included in the liquid ejection device;   a first path configured to transport the medium introduced from the introduction section;   a second path arranged downstream of the first path and configured to transport a medium;   a third path arranged downstream of the first path and configured to transport a medium;   a branch section at which the first path branches into the second path and the third path; and   a blower section configured to perform a switching operation for switching a transport destination of the medium transported on the first path to one of the second path and the third path by blowing air to the medium, wherein   when a medium that is transported first is defined as a first medium and a medium that is transported subsequently to the first medium is defined as a second medium, in a case where the blower section switches a transport destination between the first medium and the second medium, the blower section starts the switching operation while the first medium is passing through the branch section.