Document feeding apparatus

Abstract

A document feeding apparatus includes a driven roller and a feed roller rotatable with a drive shaft, an idle roller gearing with the driven roller and a document feeder. The document feeder includes a pick-up roller having a shaft portion, a cam slipping into the shaft portion and a driven gear gearing with the idle roller, a protrusion disposed on the shaft portion, one end of the cam being a spiral shape defining an end thereof, and another end defining a first engaging portion and a second engaging portion thereof, a lump disposed at a lateral of the driven gear. The feeding apparatus keeps in separation of the document from a next feed-in document and prevents the documents from overlapping.

1 . A document feeding apparatus comprising:
 a driven roller and a feed roller rotatable with a drive shaft;   an idle roller gearing with the driven roller; and   a document feeder including a pick-up roller having a shaft portion, a cam slipping into the shaft portion and a driven gear gearing with the idle roller, a protrusion disposed on the shaft portion, one end of the cam being a spiral shape defining an end thereof, and the other end being a hollow shape defining a first engaging portion and a second engaging portion thereof.   
   
   
       2 . The document feeding apparatus as claimed in  claim 1 , wherein a plane is disposed between the first engaging portion and the second engaging portion. 
   
   
       3 . The document feeding apparatus as claimed in  claim 2 , wherein the plane stretches from the first engaging portion to the second portion for forming an inclined plane. 
   
   
       4 . The document feeding apparatus as claimed in  claim 1 , further comprising a driving device, providing a power to drive the driven roller to rotate.