| 摘要 |
Before travelling through the first printing unit (14), the sheets are provided on one edge with an individual, consecutively numbered code, which is stored in a computer. This edge is cut off at a time of subsequent trimming. Before and after each operation in the successive printing stations (1,2,3) in the quality control station (4) and in the numbering station (5), these codes are read by automatic reading units (L1to L11), fed into the computer and compared in the latter with the stored values. In the case of non-correspondence, the fault is indicated. In this way, each individual sheet can be followed during its various operations and the possible loss of a sheet can be located immediately. The code of a sheet removed from the operating sequence as a sample or as faulty printing is fed by a hand operated reading unit (L3) into the computer and replacement sheets possibly introduced into the operating sequence are previously provided with a special code, which is likewise fed into the computer.
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