Rotary stencil printer having printing drum having outer peripheral wall portion substantially made of only net material

A rotary stencil printer comprising a printing drum supported to be rotatable about a central axis thereof and having a cylindrical outer surface adapted to bear a perforated stencil sheet as attached therearound and formed with openings for supplying ink to an inside surface of said perforated stencil sheet, and a back press roller supported to be rotatable about a central axis thereof extending in parallel with said central axis of said printing drum and having a cylindrical outer surface which defines a nip area with said cylindrical outer surface of said printing drum therebetween for nipping and transferring a printing sheet therethrough, said printing drum having a frame assembled of a pair of annular members forming opposite end portions thereof and a bar connecting said pair of annular members, and an outer peripheral wall portion substantially made of only a net material constructed by weaving or knitting filaments to provide said cylindrical outer surface thereof formed with said openings, said net material having a rectangular plan shape and being fastened at a leading edge thereof as viewed in a direction of movement thereof according to the rotation of said printing drum while opposite side edge strip portion are freely laid on said annular members and a trailing edge thereof opposite to said leading edge is elastically pulled toward said bar, and an internal press roller positioned so as to engage said outer peripheral wall portions at a radially inside surface thereof and to press said outer peripheral wall portion radially outwardly toward said back press roller.