| 主权项 |
1. An ink supply device of a printing machine where a plurality of ink transfer rollers which are divided in the lengthwise direction of an ink fountain roller which constitutes an ink fountain are arranged adjacent to the ink fountain roller, the respective ink transfer rollers are individually changed over between a transfer position where the ink transfer roller is brought into contact with the ink fountain roller and a non-transfer position where the ink transfer roller is disposed away from the ink fountain roller, and using a control device, based on a graph value set corresponding to a pattern area of a printed matter, ink is transferred by changing over a position of a required ink transfer roller for every transfer timing at predetermined intervals, and a rotational angle of the ink fountain roller from a position where the ink transfer roller is brought into contact with the ink fountain roller to a position where the ink transfer roller is separated from the ink fountain roller is controlled for every ink transfer roller thus controlling a circumferential length of ink transferred to the ink transfer roller from the ink fountain roller, wherein
the control device comprises: a concentration prediction value calculation means which acquires a concentration prediction value when the concentration becomes stable based on concentration measured values of predetermined number of printed matters; a graph change value calculation means which acquires a graph change value using the concentration prediction value and a concentration target value; and a control graph value calculation means which acquires a control graph value for controlling the rotational angle of the required ink fountain roller based on a preset set graph value and the graph change value. |
