Offset document pick-up device

Abstract

A flexural document pick-up device includes: a feeding path comprised of a upper wall and a lower wall; a input tray arranged upstream to the feeding path; a paper feeding unit arranged partially in the feeding path; a separation roller disposed on the opposite side of the paper feeding unit; a blocking arm disposed upstream to the paper feeding unit; a securing groove arranged on the upper wall; and a guiding unit with the following portions disposed sequentially from downstream to upstream of the feeding direction: a securing section which is secured to the securing groove, a flexure section which is extended from the securing section to the feeding path, a guiding section which is connected to the flexure section and essentially parallel to the feeding path, a lifting section which is connected to the guiding section and a vertex which is arranged on the end of the lifting section.

What is claimed is: 
     
         1 . A flexural document pick-up device includes:
 a feeding path comprised of an upper wall and a lower wall;   an input tray arranged at the upstream of the feeding path;   a paper feeding unit arranged partially in the feeding path;   a separation roller disposed on the opposite side of the paper feeding unit to be contacted with the paper feeding unit;   a blocking arm disposed between the input tray and the paper feeding unit and configured to be switchable move between a blocking position for blocking the paper and a feeding position for passing the paper through the feeding path;   a securing groove arranged on the upper wall; and   a guiding unit with the following portions disposed sequentially from downstream to upstream of the feeding direction: a securing section which is secured to the securing groove, a flexure section which is extended from the securing section to the feeding path, a guiding section which is connected to the flexure section and essentially parallel to the feeding path, a lifting section which is connected to the guiding section and a vertex which is arranged on the end of the lifting section;   wherein the guiding section is movably arranged is a seam space formed with the paper feeding unit and the separation roller, the radius of a virtual circle formed by the separation roller and the lifting section is greater than the wheel diameter of the separation roller, and the vertical distance between the lower wall and the guiding section is greater than the vertical distance between the lower wall and the separation roller.   
     
     
         2 . The flexural document pick-up device as claimed in  claim 1 , wherein the junction point of the guiding section and the lifting section is arranged upstream to contact point of the separation roller and the paper. 
     
     
         3 . The flexural document pick-up device as claimed in  claim 1 , wherein the lifting section is arranged downstream to the blocking arm in the paper feed direction. 
     
     
         4 . The flexural document pick-up device as claimed in  claim 1 , wherein the angle between the guiding section and the feeding path is smaller than the angle between the lifting section and the feeding path when viewed from an axial direction of the separation roller. 
     
     
         5 . The flexural document pick-up device as claimed in  claim 1 , wherein the blocking arm is arranged upstream to the vertex. 
     
     
         6 . The flexural document pick-up device as claimed in  claim 1 , wherein the vertical distance between the paper to be fed and the vertex is greater than the vertical distance between the paper to be fed and the bottom of the blocking arm.