Sheet-feeding auxiliary device, image forming device, and image reading device

Abstract

A sheet-feeding auxiliary device includes a sheet guiding member that is provided outside of a feed turning portion for changing a direction of feeding a sheet in a sheet path, a rotating member that is provided inside of the feed turning portion in opposite to the sheet guiding member, and a driving unit that drives the rotating member.

1 . A sheet-feeding auxiliary device comprising: 
 a sheet guiding member that is provided outside of a feed turning portion for changing a direction of feeding a sheet in a sheet path;    a rotating member that is provided inside of the feed turning portion in opposite to the sheet guiding member; and    a driving unit that drives the rotating member.    
   
   
       2 . The sheet-feeding auxiliary device according to  claim 1 , further comprising: 
 a non-driven auxiliary rotating member provided in parallel to the rotating member.    
   
   
       3 . The sheet-feeding auxiliary device according to  claim 1 , wherein 
 the driving unit drives the rotating member at a speed identical to a speed of feeding the sheet.    
   
   
       4 . The sheet-feeding auxiliary device according to  claim 1 , wherein 
 a distance between outside edges of the rotating member in an axial direction is  90  millimeters.    
   
   
       5 . The sheet-feeding auxiliary device according to  claim 1 , further comprising: 
 a roller member provided on a side of a downstream of the rotating member in the sheet path, wherein    the driving unit drives or stops the rotating member in sync with the roller.    
   
   
       6 . The sheet-feeding auxiliary device according to  claim 5 , wherein 
 the driving unit drives the rotating member via the roller by driving the roller member.    
   
   
       7 . The sheet-feeding auxiliary device according to  claim 1 , further comprising: 
 a feed roller provided on a side of an upstream of the rotating member in the sheet path, the feed roller being driven in conjunction with the rotating member; and    a one-way clutch that is engaged with the rotating member, wherein    the rotating member rotates in a driving direction when a force that rotates the rotating member in a same direction as the driving direction is received from outside.    
   
   
       8 . The sheet-feeding auxiliary device according to  claim 1 , wherein 
 the rotating member includes at least two pulleys with a belt bridged, and    a surface of the belt opposed to the sheet guiding member supports the sheet path from an inner circumferential side.    
   
   
       9 . The sheet-feeding auxiliary device according to  claim 8 , wherein 
 one of the pulleys provided on a side of a downstream in the sheet path functions as one of a pair of first carriage rollers.    
   
   
       10 . The sheet-feeding auxiliary device according to  claim 8 , further comprising: 
 an elastic member that applies a pressure on one of the pulleys provided on a side of an upstream in the sheet path, wherein    the pulley provided on the side of the upstream in the path can be retracted from the sheet path against the elastic member.    
   
   
       11 . The sheet-feeding auxiliary device according to  claim 8 , wherein 
 the driving unit rotates one of the pulleys provided on a side of a downstream in the sheet path.    
   
   
       12 . The sheet-feeding auxiliary device according to  claim 1 , wherein 
 a plurality of the rotating members is provided across a width of the sheet.    
   
   
       13 . The sheet-feeding auxiliary device according to  claim 1 , further comprising: 
 a pair of rollers that holds the sheet to feed the sheet to a downstream of the sheet guiding member in the sheet path, wherein    the rotating member assists the pair of rollers to feed the sheet.    
   
   
       14 . An image forming device comprising: 
 a sheet-feeding auxiliary device that is arranged at an inner circumferential side of a sheet path, the sheet-feeding auxiliary device including 
 a sheet guiding member that is provided outside of a feed turning portion for changing a direction of feeding a sheet in a sheet path;  
 a rotating member that is provided inside of the feed turning portion in opposite to the sheet guiding member; and  
 a driving unit that drives the rotating member.  
   
   
   
       15 . The image forming device according to  claim 14 , wherein 
 the sheet-feeding auxiliary device is provided in either one of a first path leading to a reversing unit that reverses one surface and other surface of the sheet and a second path extending from the reversing unit, in the sheet path.    
   
   
       16 . An image reading device comprising: 
 a document tray on which a sheet of a document is placed;    a document feeding unit that feeds the sheet of the document into a sheet path;    a reading unit that reads the sheet of the document fed in the sheet path, as an image;    a reversing unit that reverses one surface and other surface of the sheet of the document fed in the sheet path;    a sheet guiding member that is provided outside of a feed turning portion for changing a direction of feeding a sheet in a sheet path;    a rotating member that is provided inside of the feed turning portion in opposite to the sheet guiding member; and    a driving unit that drives the rotating member.    
   
   
       17 . A sheet-feeding auxiliary device comprising: 
 a sheet guiding means for changing a direction of feeding a sheet in a sheet path member, the sheet guiding means being provided outside of a feed turning portion;    a rotating means that is provided inside of the feed turning portion in opposite to the sheet guiding member; and    a driving means for driving the rotating member.