| 摘要 |
The invention concerns an installation comprising means controlling printing quality supplied by a printed sheet feeding device ( 1-3 ). Downstream, printing means ( 12-16 ) print serial numbers and/or affix other elements. The quality of the number printing is controlled by a control device ( 17 ). A transfer device ( 18 ) transports the sheets to a stock of three stacks ( 21, 22, 23 ) one of which collects the defective sheets. A marking device ( 19 ) affix a mark on the sheets considered unsuitable during the quality control.
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