摘要:
The present invention is directed to a process for determining the thickness of adhesive layers placed on book block backings by initially measuring the position of a backing before adhesive is applied to establish a reference point, applying adhesive, then measuring the position of the backing with adhesive to determine the thickness of the adhesive layer. Distances to a standard reference plane may be measured both before and after application of the adhesive, and the differences in respective positions may be used to determine thickness of the adhesive layer. Two such measurements before and after adhesive application are recommended, with the readings averaged to give a mean thickness of the adhesive layer. Measurements are preferably carried out by means of laser beam technology, with the aid of a beam splitter.
摘要:
In a method and an apparatus to test folded sheets for folding deviations from the reference folding line, to be used in pocket folding - or cutting folding machines, markings are made on the folding material, corresponding with the print format, and are sensed by sensors, preferably electro-optical reflection sensors after the material has been folded inside the machine, to obtain the position information. The evaluation position information derived from the output of the sensors for a number of folded sheets is rigid to determine the adjustments of the machine necessary to correct the deviations.