Media transport system turnover mechanism

Abstract

A media turnover mechanism includes a roller. A first turn bar is positioned upstream relative to the roller at an angle relative to a direction of media motion. A second turn bar is positioned downstream relative to the roller at an angle relative to a direction of media motion. A first guide is positioned between the first turn bar and the roller to direct a leading edge of a web of media toward the roller. A second guide is positioned between the roller and the second turn bar to direct the leading edge of the web of media toward the second turn bar. A third guide is positioned to direct the leading edge of the web of media around the second turn bar.

1 . A media turnover mechanism comprising:
 a roller;   a first turn bar positioned upstream relative to the roller, the first turn bar being positioned at an angle relative to a direction of media motion;   a second turn bar positioned downstream relative to the roller, the second turn bar being positioned at an angle relative to a direction of media motion;   a first guide positioned between the first turn bar and the roller to direct a leading edge of a web of media toward the roller;   a second guide positioned between the roller and the second turn bar to direct the leading edge of the web of media toward the second turn bar; and   a third guide positioned to direct the leading edge of the web of media around the second turn bar.   
     
     
         2 . The mechanism of  claim 1  wherein the second guide includes a first guide portion located on a first side of the media and a second guide portion located on a second side of the media. 
     
     
         3 . The mechanism of  claim 1 , wherein a portion of the first guide is positioned to direct the leading edge of the web of media around the first turn bar. 
     
     
         4 . The mechanism of  claim 1 , further comprising:
 a fourth guide positioned to direct the leading edge of the web of media around the roller.   
     
     
         5 . The mechanism of  claim 4 , wherein the fourth guide is hinged such that the fourth guide includes a first position adjacent to the roller to direct the leading edge of the web of media and a second position removed from the roller that provides access to at least a portion of the roller. 
     
     
         6 . The mechanism of  claim 5 , wherein the roller is a driven roller. 
     
     
         7 . The mechanism of  claim 6 , the roller being a first roller, further comprising:
 a second roller including a first position in which the second roller applies a force to the driven roller and a second position removed from the driven roller.   
     
     
         8 . The mechanism of  claim 4 , wherein a portion of the fourth guide extends to the second guide that is located downstream relative to the roller. 
     
     
         9 . The mechanism of  claim 1 , wherein a wrap of the third guide relative to the second turn bar is greater than a wrap of the first guide relative to the first turn bar. 
     
     
         10 . The mechanism of  claim 1 , wherein a wrap of the third guide relative to the second turn bar varies along a length of the second turn bar.