Screen printing machine with computerized screen adjusting mechanism

A screen printing machine comprising means for advancing a web of a material to be printed in a predetermined direction along a predetermined path;

• at least one printing unit including a screen adjacent a predetermined portion of said path and located at one side of such path, means for applying to the advancing web ink by way of such screen, and adjustable moving means for moving said screen relative to said path in at least one of a plurality of different directions including a first direction substantially coinciding with said predetermined direction, a second direction substantially counter to said predetermined direction and at least one third direction substantially transversely of said predetermined direction;
• first signal generating means including at least one camera having means for monitoring at least one of a plurality of parameters including the positions of passer marks, if any, on the web relative to said path and the position of ink on the web and for generating first signals denoting the at least one parameter;
• second signal generating means including means for evaluating first signals from said monitoring means and for generating second signals;
• and means for adjusting said moving means in response to said second signals.