| 摘要 |
For monitoring the thickness of printed products (1) which are conveyed by o ne conveying means each in a continuous conveying stream with a conveying direction (F), monitoring elements (4) are introduced into the conveying stream and on e monitoring element is allocated to each printed product. The monitoring elements (4) substantially consist of a pair of monitoring levers (10, 11) with clamping jaws (13) which are pressed against each other with a clamping force. For the monitoring, a region of each printed product (1) is clamped between the clamping jaws (1 3) of a pair of levers (10, 11) which are pressed against each other. Pairs of one monitoring element (4) and one printed product (1) interacting with each other by clamping are conveyed in succession through a monitoring area. For quantitative recording of this interaction, an image is recorded of one edge of each of the monitoring leve rs (10, 11) of one lever pair and of the distance (D) between these edges (30), whic h distance depends on the thickness of the pressed printed product (1). From this image a measured value corresponding to the distance (D) is determined. The measured value is compared with a reference range allocated to each monitori ng element (4). The reference range is constituted by a reference value determined by calibration and a predetermined tolerance range, whereby a calibration is carried out for each control element (4) using a product with a known, i.e. correct thickness.
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