Doctor blade apparatus

摘要

A doctor blade apparatus is attached to a doctor whose doctor blade is pressed against a metering roller provided in an inking train of a printing apparatus and scrapes off an excess portion of ink transferred onto the circumferential surface of the metering roller. The doctor blade apparatus comprises a blade holder attached to a base which moves toward and away from the metering roller, a doctor blade held by the blade holder and extending along substantially the entire axial length of the metering roller, and an elasticity-modifying member which abuts, along the longitudinal direction of the doctor blade, a deflection-side surface of the doctor blade whose edge is pressed against the circumferential surface of the metering roller and deflects accordingly. The elasticity-modifying member is movable toward and away from the edge of the doctor blade. A reciprocal movement mechanism reciprocally moves the elasticity-modifying member toward and away from the edge of the doctor blade. A plurality of elasticity-modifying members may be provided for a single doctor blade along the axial direction of the metering roller and may be adapted to be movable independently of each other.