Medium transport device and image forming apparatus

Abstract

A medium transport device include: an inclination corrector including a first inclination correction member and a second inclination correction member disposed away from each other in a width direction of a medium, the first inclination correction member and the second inclination correction member being individually drivable during transport of the medium, the inclination corrector being configured to correct an inclination of the medium relative to a transport direction of the medium by causing a difference in the transport of the medium between the first inclination correction member and the second inclination correction member; and a medium transporter disposed on a downstream side of the inclination corrector in the transport direction and configured to transport the medium, the medium transporter including a pair of medium transport members disposed across the medium in a thickness direction of the medium, the medium transport members being movable between a transport position where the medium transport members nip and transport the medium and a non-nipping position where a nip of the medium is canceled. During correction of the inclination of the medium by the inclination corrector, the medium transporter is moved to the non-nipping position.

What is claimed is: 
     
         1 . A medium transport device comprising:
 an inclination corrector comprising a first inclination correction member and a second inclination correction member disposed away from each other in a width direction of a medium, the first inclination correction member and the second inclination correction member being individually drivable during transport of the medium, the inclination corrector being configured to correct an inclination of the medium relative to a transport direction of the medium by causing a difference in the transport of the medium between the first inclination correction member and the second inclination correction member; and   a medium transporter disposed on a downstream side of the inclination corrector in the transport direction and configured to transport the medium, the medium transporter comprising a pair of medium transport members disposed across the medium in a thickness direction of the medium, the medium transport members being movable between a transport position where the medium transport members nip and transport the medium and a non-nipping position where a nip of the medium is canceled,   wherein, during correction of the inclination of the medium by the inclination corrector, the medium transporter is moved to the non-nipping position.   
     
     
         2 . The medium transport device according to  claim 1 , further comprising:
 a detector configured to detect a magnitude of the inclination of the medium,   wherein, if the detected magnitude has reached a predetermined magnitude, the medium transporter is moved to the non-nipping position before a leading edge of the medium in the transport direction reaches the medium transporter.   
     
     
         3 . The medium transport device according to  claim 2 , wherein, if a type of the medium is a predetermined type of paper that is easy to correct and the detected magnitude has not reached the predetermined magnitude, the medium transporter is kept at the transport position without being moved to the non-nipping position. 
     
     
         4 . The medium transport device according to  claim 1 , wherein the difference in the transport of the medium is caused by varying transport speeds of the medium between the first inclination correction member and the second inclination correction member. 
     
     
         5 . The medium transport device according to  claim 2 , wherein the difference in the transport of the medium is caused by varying transport speeds of the medium between the first inclination correction member and the second inclination correction member. 
     
     
         6 . The medium transport device according to  claim 3 , wherein the difference in the transport of the medium is caused by varying transport speeds of the medium between the first inclination correction member and the second inclination correction member. 
     
     
         7 . The medium transport device according to  claim 4 , further comprising:
 a detector configured to detect a magnitude of the inclination of the medium,   wherein the transport speeds are varied based on the detected magnitude.   
     
     
         8 . The medium transport device according to  claim 5 , wherein the transport speeds are varied based on the detected magnitude. 
     
     
         9 . The medium transport device according to  claim 6 , wherein the transport speeds are varied based on the detected magnitude. 
     
     
         10 . The medium transport device according to  claim 1 , wherein the difference in the transport of the medium is caused by varying timings to change transport speeds of the medium between the first inclination correction member and the second inclination correction member. 
     
     
         11 . The medium transport device according to  claim 2 , wherein the difference in the transport of the medium is caused by varying timings to change transport speeds of the medium between the first inclination correction member and the second inclination correction member. 
     
     
         12 . The medium transport device according to  claim 3 , wherein the difference in the transport of the medium is caused by varying timings to change transport speeds of the medium between the first inclination correction member and the second inclination correction member. 
     
     
         13 . The medium transport device according to  claim 4 , wherein the difference in the transport of the medium is caused by varying timings to change transport speeds of the medium between the first inclination correction member and the second inclination correction member. 
     
     
         14 . The medium transport device according to  claim 5 , wherein the difference in the transport of the medium is caused by varying timings to change transport speeds of the medium between the first inclination correction member and the second inclination correction member. 
     
     
         15 . The medium transport device according to  claim 6 , wherein the difference in the transport of the medium is caused by varying timings to change transport speeds of the medium between the first inclination correction member and the second inclination correction member. 
     
     
         16 . The medium transport device according to  claim 7 , wherein the difference in the transport of the medium is caused by varying timings to change transport speeds of the medium between the first inclination correction member and the second inclination correction member. 
     
     
         17 . The medium transport device according to  claim 8 , wherein the difference in the transport of the medium is caused by varying timings to change transport speeds of the medium between the first inclination correction member and the second inclination correction member. 
     
     
         18 . The medium transport device according to  claim 9 , wherein the difference in the transport of the medium is caused by varying timings to change transport speeds of the medium between the first inclination correction member and the second inclination correction member. 
     
     
         19 . The medium transport device according to  claim 10 , further comprising:
 a detector configured to detect a magnitude of the inclination of the medium,   wherein the timings to change the transport speeds are varied based on the detected magnitude.   
     
     
         20 . An image forming apparatus comprising:
 the medium transport device according to  claim 1  configured to transport a medium; and   an image former configured to form an image on the medium.