To make it possible to fully knead ink and water when keeping an ink arrangement device 4 communicating with a dampening water arrangement device 5.

A dampening water communicating passage 17 for separably communicating the ink arrangement device 4 and the dampening water arrangement device 5 is so constituted as to be consisted of a plurality of rollers including an oscillating roller 14 rollingly coming into contact with an ink distributing roller 8 and an oscillating roller 16 rollingly coming into contact with a form dampening roller 10 under the condition that a roller locating in between is an ink transfer roller 15, which makes the rolling contact with either one between the adjoining two rollers detachable.