To achieve various contact angles and pressures required for an inking operation by a single blade 1.

A tabular blade holding plate 2 whose rigidity is higher than that of the blade 1 is disposed on the rear side at the end portion of the blade 1, and the near base-end portions of the blade 1 and the blade holding plate 2 are held by blade holders 3 and 4, and fixed. Prior to the fixation, the blade holding plate 2 is made to slide toward the leading and base ends of the blade 1 to adjust the protrusion amount of the leading end portion of the blade 1 from the blade holding plate 2, accordingly, the length of the solely bent portion of the blade 1 is adjusted when pressed against the plate surface, and the apparent rigidity of the entire blade 1 protruding from the blade holders 3 and 4 is changed.