Patent ID: 7096786

Claim:
An ink fountain apparatus for a rotary printing press, which includes an ink fountain comprised of a rotatably supported ink fountain roller, a bottom plate which has a distal end close to an outer surface of said ink fountain roller and extends in an axial direction of said fountain roller, and a pair of ink dams substantially standing upright from said bottom plate and arranged to oppose in the axial direction of said ink fountain roller through a predetermined distance, an intermediate ink dam substantially standing upright from said bottom plate between said pair of ink dams, said intermediate ink dam having a first surface in contact opposite to the outer surface of said fountain roller, a second surface in contact opposite to an upper surface of said bottom plate, and a boundary portion allowing said first surface and said second surface to communicate with each other, and press means for simultaneously pressing said intermediate ink dam toward the outer surface of said fountain roller, and the upper surface of said bottom plate, wherein a width of said first surface close to said boundary portion in the axial direction of said fountain roller is set to be smaller than a width of said first surface on an upstream side of said fountain roller in a rotational direction from said boundary portion in the axial direction of said fountain roller.