Abstract: An ink knife duct-adjusting screw unit for an ink fountain in a printing press, having a contact pressure bolt engaging in the bore hole of the housing of an ink fountain and acting upon the ink knife, and a device indicating the position of the duct-adjusting screw and having a control lever. The duct-adjusting screw unit has a modified adaptor element which can be inserted into the existing threaded bore holes of the housing of an existing ink fountain. The remaining elements of the duct-adjusting screw unit can be used according to the type of the machine.

Abstract: An exact setting of an ink supply at a doctor blade of a printing press, in particular an offset printing press, is performed with special set screws, which are positioned in appropriate through-bores directed to sections of the doctor blade. It is possible to make exact, fine adjustments with two-piece set screws having a duct-adjusting screw and a set bolt which have threads with different leads. Each set screw has a counter so that these adjustments can be made without loss of time and paper.