Apparatus for controlling nozzle movement in nozzle-type dampening systems

An apparatus for controlling nozzle movement in nozzle-type dampening systems for a planographic printing press including a plate cylinder with a printing plate, the apparatus comprising a roller means having a roller, a nozzle means in which a plurality of nozzles facing said roller means along an axial line of said roller can be moved en bloc close to and away from said roller means, and a nozzle moving means for moving said nozzle means close to and away from said roller means;

• dampening solution injected through said nozzle means is fed over the surface of said roller characterized in that said apparatus for controlling nozzle movement comprises a motor for driving said nozzle moving means to cause said nozzle means to move, a nozzle position signal output means for outputting the present position of said nozzle means moved by said motor with respect to a predetermined reference position, a moving position setting means for setting in advance moving positions to which said nozzle means is to be moved, an operating pulse output means for outputting pulse signals in synchronism with the rotation of said plate cylinder of the printing press, a data select signal output means for detecting the operating speed of said printing press from pulse signals output by said operating pulse output means and outputting data select signals in accordance with said detected operating speed, a nozzle movement signal output means for generating a nozzle moving signal selecting a moving position to which said nozzle means is to be moved from among moving positions set in said moving position setting means, and an operating signal output means for producing a motor operating signal based on said nozzle moving signal generated by said nozzle moving signal output means and an output of the present position of said nozzle means output by said nozzle position signal output means.