The machine part is in the aluminum models in the board platform to place a rotating disc together, on the plate puts the paper barrel. On installs the double-hinged arm, the arm step-by-steps the motor control by two, the platform step-by-steps the motor control by one. The terminal arm grips the pen which the useful writing brush wool makes, at the same time the paper barrel rotation the pen nearby the paper barrel makes the vertical motion, like this drew the stroke in the paper barrel. The big arm and the platform have the mechanical spacing, enulls before the movement uses, between the small arm and the big arm also has the same spacing. Machine's each kind of size parameter establishes the Const convenience adjustment in the procedure.