PRINTING DENSITY ADJUSTING APPARATUS

PROBLEM TO BE SOLVED: To obtain printing density with high accuracy by properly setting the supply amt. of ink by providing a setting means performing the correction related to a dot gain corresponding to the dot area ratio of the principal pattern part of a printing plate when a control objective value is set. SOLUTION: In a setting control means 5, the setting of the objective value of the thickness of the ink film on an ink roller 10 is performed. The objective value is determined by performing the correction related to pattern area ratio data, a kind of ink, a kind of paper, a type of a printing press, a printing speed, water content and a dot gain. Next, the state quantity related to the thickness of the ink film is detected by a detection head 1 and the actually measured value of the thickness of the ink film is operated by an operation means 4. Next, the objective value and the actually measured value are displayed on a display means 6 to be compared with each other by the operation means 4 to operate operation quantity. This operation quantity is inputted to a remote controller 11 and the opening degree of the ink adjusting key of an ink apparatus is corrected on the basis of distribution operation quantity and the rotational speed of an ink fountain roller is corrected on the basis of the whole operation quantity.