Abstract: For fitting a strip-like flexible metal doctor blade (4) into the usual clamp means (1, 2) of a rotary printing machine there is used a guide (5) having first and second stop surfaces (5a, 5b) which are linear and parallel, and are spaced by the extent by which it is desired that the blade (4) shall eventually protrude from the clamp means (1, 2). The blade (4) is abutted against one stop surface (5a), and is then secured in the guide (5). The guide (5), with the blade (4) in it, is then moved to cause the second stop surface (5b) to abut against the clamp means (1), with the protruding portion of the blade (4) inserted into the clamp means (1, 2). The clamp means (1, 2) are tightened onto the blade (4), and the guide (5) is removed. For a blade (4) consisting of two strip-like parts placed face to face, the guide ( 5) is provided with a step. One blade part is abutted against the stop surface, and the other blade part is abutted against the step.

Abstract: An assembly for supporting and guiding a doctor blade to be applied against the surface of a rotary printing cylinder in a printing machine. The assembly includes the combination of a backing member which is secured on the edge of the doctor blade which is remote from the surface of the cylinder, the provision of parallel surfaces in the mounting with which the backing member is in sliding contact, and the use of a bag within the mounting and which serves for the application of fluid pressure on the backing member to urge the blade in the direction against the surface of the printing cylinder.