of control ports 624 624 according to the present embodiment of a squeegee blade assembly 8 a pair of control cylinders 613 614 are provided respectively having a pair of control ports 624 624 the control cylinders 613 614 conduct driving power for the squeegee mechanism via compressed gas or the like fig8 a b and c show various mounting configurations of paired squeegee blade assemblies 8 according to the method of the invention which is facilitated according to the enclosed squeegee structure of the invention referring to fig8 a an arrangement in which two squeegee assemblies are mounted so as to be angled in opposing directions that is the leading right side assembly is angled downwardly in a direction opposite the printing direction p and the trailing assembly is angled downwardly in the printing direction p fig8 b shows an arrangement wherein both assemblies are angled in parallel in this case against the printing direction p then in fig8 c an arrangement is shown in which the squeegees are angled in parallel in the printing direction according to such mounting positions various types of printing operations may be accomplished with high flexibility of the apparatus assuring that the best quality results are achieved the squeegee mounting is connected with drive means for allowing the direction of printing edge portions thereof to be varied thus reciprocative printing may be easily accomplished referring now to fig9 a paired squeegee blade portion.