Methods and apparatus for minimizing screen patterns in xerography, electrostatic screen process and other forms of printing

Claim 1

A PRINTING PROCESS OF THE TYPE EMPLOYING A STENCIL AND A SCREEN COMPRISING THE STEPS OF PROVIDING A STENCIL HAVING OPENINGS THEREIN DEFINING AN IMAGE AREA TO BE PRINTED, PROVIDING A SCREEN MEMBER HAVING A PLURALITY OF UNOBSTRUCTED OPENINGS THEREIN IN REGISTRY WITH SAID STENCIL, POSITIONING A SUBSTRATE TO BE PRINTED UPON IN REGISTRY WITH THE STENCIL AND SCREEN, APPLYING A PRINTING SUBSTANCE FOR FORMING AN IMAGE UPON THE SUBSTRATE AS INDICATED BY THE STENCIL AND SCREEN, SHIFTING THE SCREEN IN A PREDETERMINED PATTERN RELATIVE TO THE STENCIL AND SUBSTRATE, AND SUBSEQUENTLY REPEATING THE STEP OF APPLYING PRINTING SUBSTANCE AS DICTATED BY THE STENCIL AND SCREEN TO THE SAME SUBSTRATE, SAID SHIFTING STEP CAUSING SAID PRINTING SUBSTANCE TO BE APPLIED TO AT LEAST PARTIALLY DIFFERENT AREAS OF SAID SUBSTRATE IN EACH OF SAID APPLYING STEPS.