PURPOSE: To easily regulate the rocking amounts of rollers according to the kinds of printing materials for an inking device with various roller group arrangements by connecting a groove cam with a roller through a cam follower.

CONSTITUTION: Adjacent rollers 8 and 9 are connected with an arm 12, and the roller 9 of these rollers 8 and 9 is connected to the frame 13 with a rotary shaft 27 set rotationally through a bearing 26 in parallel with the rollers 8 and 9 and an arm 28. One end of the shaft 27 is projected outwards through one frame 13, and the projected end forms an inclined shaft 27a with any angle (α) to the axis (a) of the shaft 27. A groove cam 29 is fixed to the shaft 27a by a bolt 30 in an adjustable manner with respect to the position of the turning direction. Cam followers 31 and 31' provided to both ends of the arm 28 are fitted into the round cam groove 29a of the cam 29 and the annular groove 17a of the guide wheel 17 in a slidable manner toward turning directions and also in a state of being stopped with respect to the axial movement.