Device for feeding papers

Abstract

Disclosed is a paper feeding device comprising a storage surface for a stack of papers, with a leading edge, a trailing edge, and a first and a second side edge. The surface is adapted to be moved vertically. The device further comprises a vacuum feeder for feeding papers from their position on the storage surface and imparting on an uppermost sheet of paper a horizontal displacement, and a blower arrangement adapted to provide a curtain of air separating the uppermost sheet of paper from the rest of the stack of papers. The blower arrangement comprises a front blower unit having air openings with a first portion adapted to create first air cones and second portions adapted to create second air cones, wherein the first air cones are different from the second air cones.

1 . A paper feeding device comprising:
 a storage surface for a stack of papers, the storage surface having a leading edge, a trailing edge, and a first and a second side edge and being adapted to be move vertically between a first, lower end position and a second, upper end position,   a vacuum feeder for feeding papers from their position on the storage surface and imparting an uppermost sheet of paper a horizontal displacement,   a blower arrangement adapted to provide a curtain of air separating the uppermost sheet of paper from the rest of the stack of papers,   wherein the blower arrangement comprises a front blower unit provided along the leading edge of the storage surface, the front blower unit having air openings comprising a first portion adapted to create first air cones and a second portion adapted to create second air cones,   wherein the first air cones are different from the second air cones,   wherein the first air cones are created in a first direction, the second air cones are created in a second direction, and   wherein the second direction is different from the first direction.   
     
     
         2 . The paper feeding device of  claim 1 , wherein the first portion is vertically displaced approximately 5 mm in relation to the second air opening. 
     
     
         3 . The paper feeding device of  claim 1 , wherein the front blower unit provides four air flows. 
     
     
         4 . The paper feeding device of  claim 1 , wherein the width of each air opening is between 20 and 40 mm. 
     
     
         5 . The paper feeding device of  claim 4 , wherein the width of each air opening is between 25 and 35 mm. 
     
     
         6 . The paper feeding device of  claim 5 , wherein the width of each air opening is about 28 mm. 
     
     
         7 . The paper feeding device of  claim 1 , wherein the height of each air opening is between 10 and 20 mm. 
     
     
         8 . The paper feeding device of  claim 7 , wherein the height of each air opening is about 14 mm. 
     
     
         9 . The paper feeding device of  claim 1 , wherein the first air cone comprises about 60% of the air, and the second air cone comprises about 40% of the air. 
     
     
         10 . The paper feeding device of  claim 1 , wherein the first and second air cones have the same shape. 
     
     
         11 . The paper feeding device of  claim 1 , wherein the first and second air cones have a similar shape. 
     
     
         12 . A paper processing machine comprising the paper feeding device according to  claim 1 .