Abstract: To permit safe removal of a carrier plate supporting a plurality of doctor blade adjustment motors and gearing elements therefor, and additionally, at the outside of the plate, position indicating and transducer elements, at least one, and preferably two or more support rails are secured to the doctor blade holding frame, extending from the frame in a direction beyond the side of the carrier plate and remote from the side facing the doctor blade, on which the motor and gearing is secured. The plate is formed with openings, forming suspensions (26) slidable on the rails (23) for lateral removal of the plate, together with all equipment carried thereon, and disengagement of electrical contacts (8) from matching contact rails or buses carried in the frame.

Abstract: To provide an accurate output indication of the actual position of a doctor blade, as distinguished from a commanded position, in which the commanded position is determined by a positioning pin (15) in engagement with a doctor blade which, in turn, is moved into a predetermined position by an actuating pin (10) in end-face engagement therewith, the actuating pin (10) is formed with a through-bore in which a feeler pin is located which is spring-loaded to be pushed at all times into engagement with the positioning pin (15) even though the actuating pin (14) may have withdrawn to a position which is not followed by the positioning pin (15) leaving a gap between the end of the positioning pin (15) and the actuating pin (10). The actual position of the feeler pin (14) can be indicated on a scale by transmission of motion by a double-arm lever which, preferably, has unequal arm length to amplify positional changes of the feeler pin, and, if desired, additionally by coupling to an electrical position transducer.