To provide a stencil printing press capable of improving accuracy to determine the necessity of contamination reducing treatment.
This stencil printing press 1 comprises a first drum 21 for printing an image with a first ink 93, a first press roller 23 for making the first drum 21 press printing paper PA, a second drum 71 arranged downstream in a conveyance path, relative to the first drum 21, a second press roller 73 for making the second drum 71 press a printing medium, a time storage means for storing the printing finish time of the first drum 21, and a control part for controlling the first drum 21, the first press roller 23, the second drum 71 and the second press roller 73. The control part 14 executes the contamination reducing treatment, in the case that the passing time PT counting from the printing finish time PET is greater than the threshold values ThB, Th1 and Th2 which are set according to at least either one of the content of perforations HP of a stencil 91 which is wound around the first drum 21 or an ink color density constant ID of the first ink 93.
Masakazu Ito
Shunichi Takahashi