| 摘要 |
The invention relates to apparatus and a method for correcting register faults based on changes in machine state (4, 4', . . . ; 5, 5', . . . ) in a multicolor printing machine (1) having a number of printing units (13, 13', . . . ) with image cylinders (14, 14', . . . ) and equipment (2, 2', . . . ) for the digital production of color separations (3, 3', . . . ) on the image cylinders (14, 14', . . . ), the actions of setting up and combining the color separations (3, 3', . . . ) being controlled in such a way that in-register prints are achieved. The known methods and apparatus of this type detect register faults by means of test prints, for example, by means of register marks. As a result, changes, which lead to disturbances to the register accuracy, are registered only when a register fault is already present. By means of the invention, the occurrence of register faults as a result of dimensional changes, in particular between the printing units (13, 13', . . . ), is to be prevented to the largest possible extent from the start. This is achieved by changes in machine state (4, 4', . . . ; 5, 5', . . . ) being registered and, on the basis of these changes in machine state (4, 4', . . . ; 5, 5', . . . ), the production of the color separations (3, 3', . . . ) is changed in such a way that a disturbance to the register accuracy of the print, threatened by a change in machine state (4, 4', . . . ; 5, 5', . . . ), is compensated for.
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