Oblon, Spivak, McClelland, Maier & Neustadt, P.C.
Method and apparatus for preventing ink blurring in a stencil printer
 A method of printing a document image on a paper by wrapping a stencil, or master, perforated by, for example, a thermal head around a print drum, and a stencil printer. A wedge effect occurs between the print drum and an ink roller disposed in the print drum. The wedge effect, coupled with the pressure of a pressing member, causes ink to exude from the inner periphery to the outer periphery of the print drum and further from the master to the paper. The paper is separated from the master at a position downstream, with respect to the direction of rotation of the print drum, of a portion where the ink exudes due to the wedge effect. At the paper separating position, the ink does not exude from the master, and the ink pressure does not act. This obviates the blur of a printed image and prevents the ink from being transferred from the front of an underlying printing sheet to the rear of an overlying printing sheet stacked on the underlying sheet due to excessive ink transfer. 
Tohoku Ricoh Co., Ltd.
B B
B41L B41L
inventional inventional
Michio Tomiya Hironobu
Kurashige Mori Takasawa