| 摘要 |
Method of monitoring the transport of print products in a printing-field machine includes, in a first step, forming, in a control device, monitoring zones for leading and trailing edges of a print product, for a zone free of a print product and for a print-product zone, by initially determining the positions of the leading and trailing edges over a defined number of print products and storing them in the control device; by, furthermore, checking the mean values, determined on the basis of measured position values of the leading and trailing edges, as to whether the mean values exceed a given tolerance range; if the tolerance range is exceeded and if a detection system does not produce a signal after the transport device has moved somewhat, re-determining the positions of the leading and trailing edges over a further defined number of print products and storing them in the control device until the mean values are within the tolerance range and, thereafter, defining the monitoring zones in which the signal generated by the detection system for the respective zones may be present; in a second step, determining the actual positions of the edges of all further print products and checking as to whether the respective edges are within the given monitoring zone for the respective edge, and as to whether the print product is within the print-product zone, as to whether the print product is really not within the print-product-free zone, and quickly stopping the machine if the outcome of the check is negative.
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