Patent ID: 8168254
Filing Date: 2012-05-01
Classification: A61F,B65H

Abstract:
1. A method for synchronized positioning of at least one essentially continuous web of material, for manufacturing products that comprise printed motifs or processed elements, which web of material is adapted to be divided into nominal division lengths and comprises synchronization marks that recur at regular intervals, which method comprises: feeding the web of material into a production apparatus at a first speed; processing the web material in the production apparatus with various process steps for the manufacture, with the web of material being fed forward at a second speed; and detecting each synchronization mark, each synchronization mark for positioning a respective one of the printed motifs in a predetermined position on each product; generating a virtual master function which includes a cyclic clock where a number of cycles per product, or alternatively a number of products per cycle, consists of an integer, and reading an actual value in the virtual master function corresponding to a detected synchronization mark; comparing the actual value with an expected value of the virtual master function, the expected value corresponding to an intended position of a synchronization mark; and stretching the web of material in response to any deviation between the actual value and the expected value, with an aim of minimizing the deviation.