Sheet feeder capable of reducing multi feed

Abstract

A sheet feeder reducing multi feed, which may include a feed roller to feed a plurality of sheets, a sole plate to press stacked sheets against the feed roller moving between an evacuation position and a pressing feed roller position, a separation pad member provided downstream from the sole plate in a feeding sheet direction switching between in contact and out of contact with the feed roller to separate the plurality of sheets one by one, and a protruding guide member provided near the separation pad member in a feeding sheet path to guide the sheets by contacting an under side of each sheet each to control the sheet's downward movement.

1 . A sheet feeder, comprising: 
 a feed roller to feed a plurality of sheets;    a sole plate to press stacked sheets against the feed roller, which is movable between an evacuation position and a pressing feed roller position;    a separation pad member provided downstream from the sole plate in a feeding sheet direction capable of switching between in contact and out of contact with the feed roller to separate each of the plurality sheets one by one in a nip press region with the feed roller; and    a protruding guide member provided near the separation pad member in a feeding sheet path to guide each of the plurality sheets by contacting an under side of each of the plurality of sheets and controlling a downward movement of each of the plurality of sheets.    
   
   
       2 . The sheet feeder of  claim 1 , wherein the protruding guide member is a nip press holding member in the nip press region.  
   
   
       3 . The sheet feeder of  claim 1 , wherein the protruding guide member prevents each of the plurality of sheets from deviating from the feeding sheet path.  
   
   
       4 . The sheet feeder of  claim 1 , wherein the protruding guide member is provided upstream from the nip press region in the feeding sheet path.  
   
   
       5 . The sheet feeder of  claim 1 , wherein the protruding guide member protrudes in the feeding sheet path through the nip press region.  
   
   
       6 . The sheet feeder of  claim 1 , wherein the protruding guide member protrudes higher than a sheet approaching edge part of the separation pad member in the feeding sheet path when the feed roller is in contact with the separation pad member.  
   
   
       7 . The sheet feeder of  claim 1 , wherein the protruding guide member is provided as a pair of protruding guide members on both sides of the separation pad member in the feeding sheet path.  
   
   
       8 . The sheet feeder of  claim 1 , wherein the protruding guide member is provided to form a gap between a tip of the protruding guide member and an undersurface of the feed roller.  
   
   
       9 . The sheet feeder of  claim 1 , wherein the protruding guide member is formed with a lower friction material.  
   
   
       10 . The sheet feeder of  claim 1 , wherein the protruding guide member is formed with an abrasion resistant material.  
   
   
       11 . The sheet feeder of  claim 1 , wherein a height of the protruding guide member is adjustable.  
   
   
       12 . The sheet feeder of  claim 1 , wherein the protruding guide member includes a roller to guide each of the plurality of sheets.  
   
   
       13 . The sheet feeder of  claim 1 , wherein an angle of gradient of a tip of the protruding guide member is almost the same as a sheet feeding angle into the nip press region.  
   
   
       14 . The sheet feeder of  claim 1 , wherein a downstream part of the separation pad member rotates under the feed roller and the separation pad member includes a friction pad on the nip press region side of the separation pad member.  
   
   
       15 . The sheet feeder of  claim 1 , further comprising: 
 a guide member to upwardly guide each of the plurality of sheets passing through the nip press region.