DOCTOR BLADE CHAMBER

An ink chamber doctor blade for acting upon an ink transfer roll of a rotary press with a fluid, in particular with a printing ink, has an ink chamber, which is filled with ink during printing, and which extends in an axial direction of the ink transfer roll, and two doctor blades which are in physical contact with the ink transfer roll during printing and which extend in the axial direction of the ink transfer roll. At least one additional doctor blade can be inserted into the ink chamber doctor blade and can be fixed by holding devices inside the ink chamber. The holding device has at least one element, which is pretensioned by elastic force against at least one counter holder, and with which the additional doctor blade can be pressed against the counter holder.