A chambered doctor blade device intended for a printing unit and adapted to coat a rotatable cylinder (2) with ink, lacquer, adhesive or the like, comprises an elongate frame (8) which is arranged parallel to and outside the cylinder (2) and on which are mounted two parallel, elongate and spaced-apart doctor blades (9,10) to be resiliently and scrapingly applied against the cylinder (2) in operative position. An elongate chamber (11) holding ink (12) or the like is defined by the doctor blades (9,10), the surface of the frame (8) facing the cylinder (2), and the circumferential surface of the cylinder (2). To achieve good flexural and torsional rigidity, the frame (8) comprises at least two elongate interconnected metal sections (13,14) which are made of bent thin sheet-metal, preferably of stainless steel, and by means of which the elongate portion of the frame (8) located between the mounting places for the doctor blades (9,10) forms an elongate stiffening or reinforcing portion. Such a frame (8) ensures, in operation, a set constant distance between the frame (8) and the cylinder (2) and, consequently, constant application of the doctor blades (9,10) against the cylinder (2).